Hi! A type O individual, often known as a universal donor, does not produce the antigenic A or B oligosaccharides on their red blood cells. This means they can donate blood to any recipient without triggering an immune response, making their blood compatible with all blood types.
Answer- Sure! Type O blood individuals do not have the A or B antigens on their red blood cells due to the lack of expression of the corresponding oligosaccharides. This means that they can donate their blood to any recipient without causing an immune reaction because the recipient's immune system will not recognize the O blood cells as foreign. However, individuals with type O blood can only receive blood from other type O donors because their immune system will react to the presence of A or B antigens on the red blood cells of other blood types.
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In an ecosystem with four levels—producers, primary consumers, and two higher-level consumers—describe where the decomposers operate within the context of these trophic levels. Provide at least two examples.
Decomposers break down dead organic matter into simpler inorganic compounds for uptake by plants and other organisms.
Thus, in an ecosystem consisting of producers, primary consumers, two higher-level consumers, decomposers operate at the lowest trophic level, along with plants where they break down dead organic matter to produce nutrients.
In a forest ecosystem, decomposers like fungi break down dead plant material and return nutrients like carbon, phosphorus, etc. back to the soil allowing producers like plants to take up these nutrients for growth. Decomposers like earthworms also break down dead plant material that contributes to the nutrient cycling, thereby, supporting the growth of grasses, herbivores, etc.
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What happens inside your body when you ride a thrilling roller coaster? (5 points)
1 The adrenal glands release adrenaline.
2 The adrenal glands release glucagon.
3 The thyroid gland releases glucagon.
4 The thyroid gland releases adrenaline.
The Adrenal glands release adrenaline when one rides a thriller roller coaster.
Adrenaline is a type of hormone that is released inside the boy by the adrenal glands when the mind senses any kind of danger to the individual like running away from an attack or getting ready for a fight or even when in terms of sports etc.
When one rides the roller coaster the body starts to predict the possible danger to the individual and as the sudden movements of the body fluids start to take place when in motion the mind takes it as a sense of danger and starts preparing the body for the danger by producing adrenaline.
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Answer: The Adrenal glands release adrenaline when one rides a thriller roller coaster.
Explanation:
In order to make the largest impact, where should efforts be focused to reduce greenhouse gas emissions?a) tropical nations b) mid-latitude nations c) Arctic nations d) Antarctica
To make the largest impact in reducing greenhouse gas emissions, efforts should be focused on b) mid-latitude nations.
Efforts to reduce greenhouse gas emissions should be focused on mid-latitude nations as they are responsible for the largest share of global emissions. However, it is important to note that all nations, including tropical, Arctic, and Antarctica, should also take action to reduce emissions as climate change is a global issue that affects everyone.
To make the largest impact in reducing greenhouse gas emissions, efforts should be focused on b) mid-latitude nations. These nations, including major industrialized countries such as the United States, China, and countries in Europe, contribute significantly to global greenhouse gas emissions due to their high levels of industrialization, energy consumption, and transportation activities. By focusing efforts on these nations, the potential for reducing overall emissions is much greater than in tropical, Arctic, or Antarctic regions.
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Which element's isotope is commonly used to determine when biological samples such as fossils, were formed?
Carbon-14 is the isotope commonly used to determine when biological samples such as fossils were formed. Carbon-14 dating is a technique that measures the amount of carbon-14 in a sample and compares it to the amount of carbon-14 in the atmosphere at the time the sample was alive. This allows scientists to determine the age of the sample.
Carbon-14 (14C) is the isotope commonly used to determine the age of biological samples such as fossils, bones, and other remains. Carbon-14 is a radioactive isotope of carbon that is present in all living organisms in small amounts. When an organism dies, it stops taking in carbon-14, and the amount of carbon-14 in its remains begins to decay at a predictable rate. By measuring the amount of carbon-14 remaining in a sample and comparing it to the initial amount of carbon-14, scientists can estimate how long ago the organism died. This technique is known as radiocarbon dating and is widely used in archaeology, anthropology, and other fields to date biological samples.
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A mutant strain of bacteria will produce the structural enzymes in the lac operon regardless of the concentrations of glucose or lactose. Most likely, this strain is defective in the genea repressor b. B-galactosidasec. permeased. operator e transacetylase
If a mutant strain of bacteria is able to produce the structural enzymes in the lac operon regardless of the presence of glucose or lactose, it is most likely that the strain is defective in the gene for the repressor protein. The correct option is A.
The lac operon is a genetic system that regulates the metabolism of lactose in E. coli. The repressor protein is responsible for inhibiting the transcription of the lac operon when there is no lactose present.
When lactose is present, it binds to the repressor protein, causing a conformational change that leads to the release of the repressor and the induction of the lac operon.
The other options - b-galactosidase, permease, operator, and transacetylase - are all involved in the metabolism of lactose, but they do not play a direct role in the regulation of the lac operon.
B-galactosidase is the enzyme that breaks down lactose into glucose and galactose. Permease is a membrane protein that allows lactose to enter the cell. The operator is a DNA sequence that the repressor protein binds to. Transacetylase is involved in the detoxification of certain compounds in the cell.to know more about lac operon refer here:
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Based on your question, it seems that the mutant strain of bacteria is defective in the lac operon's regulatory mechanism. Most likely, this strain is defective in the gene for the repressor protein, which would result in the continuous production of structural enzymes in the lac operon regardless of glucose or lactose concentrations.
Based on the given information, the most likely answer is that the mutant strain of bacteria is defective in the gene repressor. The lac operon is regulated by the gene repressor, which controls the production of structural enzymes in response to the availability of glucose and lactose. If the gene repressor is defective, it means that it cannot bind to the operator region to prevent the transcription of the structural enzymes, which will result in the production of the enzymes regardless of the concentrations of glucose or lactose. The other options (B-galactosidase, permease, operator, and transacetylase) are all components of the lac operon, but their functions are not related to the regulation of the operon by the gene repressor.
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Explain how the elements that form fossil fuels are conserved during the carbon cycle
Answer: Release carbon back into the when the atmosphere fossil is burned
How are farmlands in the US at risk due to the rise of new housing developments?
Farmlands in the United States are at risk due to the rise of new housing developments in several ways; Land Conversion, Fragmentation and Parcelization, and Increased Land Values and Taxes.
One of the primary risks to farmland from new housing developments is land conversion. As urbanization and population growth continue, there is increasing demand for land to build new housing developments, resulting in the conversion of farmland into residential, commercial, or industrial areas.
New housing developments can also contribute to the fragmentation and parcelization of farmland. Fragmentation refers to the division of large tracts of farmland into smaller parcels, while parcelization refers to the splitting of farmland into smaller plots for development.
The rise of new housing developments can also drive up land values and property taxes in the surrounding areas, including farmland. This can put economic pressure on farmers and landowners, making it financially challenging to sustain agricultural operations, especially for small and mid-sized farms.
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At a point in the cell cycle, chromosomes have aligned near the middle of a cell. Which sequence of events will the cell need to complete to produce two identical daughter cells?
Answer:
Anaphase, telophase, cytokinesis
Animals that live in fresh water must maintain their osmolarity in the face of constant water intake. One way they cope with this is by expelling __________ amounts of ________ urine.A) small; concentratedB) small; diluteC) large; osmoticD) large; diluteE) large; concentrated
Animals that live in freshwater must maintain their osmolarity in the face of constant water intake. One way they cope with this is by expelling large amounts of dilute urine. The right option is D, large; dilute.
This means that they need to regulate the balance of water and salts in their bodies.
One way they cope with this is by expelling large amounts of dilute urine.
This helps to remove excess water from their bodies while retaining essential salts.
By producing dilute urine, freshwater animals are able to regulate their osmolarity and maintain a healthy balance of water and salts.
This is in contrast to animals that live in saltwater, which must conserve water and excrete excess salts.
Overall, the ability to regulate osmolarity is crucial for the survival of freshwater animals, and the production of dilute urine is an important adaptation that allows them to thrive in their freshwater environments. Therefore, the right answer is D, large; dilute.
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Question 32
The presence of bacteria responsible for typhoid fever in a public water supply could be traced to:
a. Fecal contamination
b. Excessive water aeration
c. Pus from skin lesions
d. Rotting animal and fish remains
Typhoid-causing bacteria could be found in a public water source as a result of fecal contamination. Here option A is the correct answer.
The presence of bacteria responsible for typhoid fever in a public water supply is most likely traced to fecal contamination. Typhoid fever is caused by the bacterium Salmonella enterica serotype Typhi, which is primarily transmitted through the ingestion of contaminated food or water. The bacteria are shed in the feces of infected individuals and can contaminate water sources through inadequate sanitation practices.
The bacteria can survive in water for several weeks and can infect individuals who consume the contaminated water. The risk of transmission is higher in areas with poor sanitation infrastructure and where there is a lack of access to safe drinking water.
Excessive water aeration and rotting animal and fish remains are unlikely sources of typhoid fever transmission. Excessive water aeration can increase the oxygen levels in the water, which can promote the growth of aerobic bacteria but is not directly linked to the transmission of typhoid fever.
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Graded potentials are _______ stimulus strength; action potentials are _______. A) independent of; independentB) independent of; dependentC) dependent on; independentD) dependent on; dependent
Graded potentials are dependent on stimulus strength; action potentials are independent. Therefore, the correct answer is C) dependent on; independent.
Graded potentials are tiny changes in membrane potential caused by a stimulation. The amplitude of the graded potential is related to the stimulus strength. As a result, stronger stimuli produce larger graded potentials.
Action potentials, on the other hand, are all-or-nothing events that occur when the membrane potential crosses a particular threshold. The threshold is a set value, and when it is reached, regardless of the strength of the initial stimulus, an action potential is produced.
The power of the stimulus that generated the action potential has no effect on its amplitude.
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What are the FOUR most dangerous indoor air pollutants?
The four most dangerous indoor air pollutants are: Carbon Monoxide (CO), Radon, Volatile Organic Compounds (VOCs) and Particulate Matter (PM).
The following are the four most harmful indoor air pollutants:
CO is a colourless, odourless gas that can be created by fuel-burning appliances such as gas stoves, heaters and furnaces. Radon is a radioactive gas created naturally by the decay of uranium in soil, rock, and water. Volatile Organic Compounds (VOCs): VOCs are chemicals present in a variety of common household items, including paints, solvents, cleansers, and air fresheners. Particulate Matter (PM): Particulate Matter (PM) is a mixture of solid and liquid particles found in the air. Tobacco smoke, cooking, and lighting candles are all sources of PM.For such more question on Carbon Monoxide:
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in bearded dragons, dark coloring brown or grey is dominant over light coloring (orange or yellow), and opaque nails are dominant over translucent nails. A cross was made between a yellow male with translucent nails and a brown female with opaque nails (heterozygous for both traits. what are the possible genotypes of the offspring ? What is the phenotype rate?
There are four possible genotypes for offspring: DdLl, DdlL, ddLl, and ddll. The phenotype rate is the ratio of the number of offspring Phenotype rate for dark and opaque is 50%, and the phenotype rate for light and translucent is also 50%.
What is meant by phenotypes?Phenotypes refer to the observable physical and biochemical characteristics of an organism that are determined by its genotype and the environment.
Let D represent allele for dark coloring, and let L represent allele for opaque nails. Similarly, let d represent the allele for light coloring, and let l represent allele for translucent nails.
Genotype of yellow male with translucent nails is ddll, as he is homozygous recessive for both traits. The brown female with opaque nails is heterozygous for both traits, so her genotype is DdLl.
We can construct Punnett square by crossing the gametes of the male with those of the female.
Gametes of Male: d l
-----
d l
Gametes of Female: D l
-----
D L
d L
Offspring: DdLl DdlL ddLl ddll
----------------------------
Phenotype: Dark Dark Light Light
Opaque Transl. Opaque Transl.
From the Punnett square, we can see that there are four possible genotypes for the offspring: DdLl, DdlL, ddLl, and ddll.
In this case, we can see that the phenotype ratio of dark and opaque to light and translucent is 2:2, or 1:1. So, phenotype rate for dark and opaque is 50%, and the phenotype rate for light and translucent is also 50%.
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The "t" in tRNA is short for transfer. In a complex sentence, explain why this molecule is called transfer RNA.
Transfer RNA (tRNA) is called so because it plays a crucial role in transferring amino acids to the ribosome during protein synthesis.
Proteins are formed up of chains of amino acids that tRNA molecules transport to the ribosome in a specified order.
Each tRNA molecule transports a specific amino acid and contains a nucleotide sequence that is complementary to the codon on the mRNA (messenger RNA) that defines that amino acid.
The amino acid carried by the tRNA is added to the developing protein chain when it binds to the mRNA.
In this approach, tRNA functions as a transfer molecule, delivering the correct amino acid to the ribosome at the appropriate time, allowing the ribosome to construct a protein with the correct amino acid sequence.
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To what organ do the lymphatic vessels return protein-rich escaped fluids to rejoin circulation?.
The lymphatic system is a network of vessels and organs that helps to maintain fluid balance in the body and defend against infections.
The lymphatic vessels are responsible for collecting and transporting lymph, a fluid that contains white blood cells and other immune cells, throughout the body. Lymphatic vessels collect excess fluid, waste materials, and other substances from the tissues and return them to the bloodstream.
The lymphatic vessels ultimately drain into a large vessel called the thoracic duct, which returns the lymph to the bloodstream via the left subclavian vein. The protein-rich escaped fluids are also returned to the bloodstream via the lymphatic vessels, which prevent the accumulation of excess fluids in the tissues and help to maintain fluid balance in the body.
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Question 59
UVA has been associated with all of the following except:
a. Excessive skin wrinkling
b. Cataracts
c. Enhancement of the effects of the sun
d. Lessened sunburning
Answer: d. Lessened sunburning UVA (ultraviolet A) radiation is a type of electromagnetic radiation that can penetrate deep into the skin and cause damage.
It is commonly associated with skin aging and an increased risk of skin cancer. UVA radiation can also enhance the effects of UVB radiation (another type of ultraviolet radiation) from the sun, leading to sunburns and other skin damage. While excessive exposure to UVA radiation can lead to skin damage and contribute to the development of skin cancer, it does not actually lessen sunburning. In fact, UVA radiation can make sunburns worse by enhancing the effects of UVB radiation. This is why it is important to protect your skin from both UVA and UVB radiation when spending time in the sun.
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in the circulatory system, the muscular organ that pumps blood is called the
In the circulatory system, the muscular organ that pumps blood is called the heart.
It is a powerful organ that works continuously throughout a person's life to circulate blood to all parts of the body. The heart is located in the chest cavity, between the lungs, and is roughly the size of a closed fist. It is composed of four chambers: the right atrium, the right ventricle, the left atrium, and the left ventricle. The atria receive blood from the body and the lungs, while the ventricles pump the blood back out to the body and the lungs. The heart is surrounded by a protective sac called the pericardium, and it is supplied with oxygen and nutrients by a network of blood vessels called the coronary circulation. The heart muscle, or myocardium, is composed of specialized cells called cardiac myocytes that are capable of generating their own electrical impulses and contracting rhythmically to pump blood.
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Biological factors that impede two different species from producing viable, fertile offspring result in
Biological factors that impede two different species from producing viable, fertile offspring result in reproductive isolation.
Reproductive isolation is an important factor in the formation of new species, as it prevents gene flow between populations and promotes genetic divergence. There are two main forms of reproductive isolation: prezygotic and postzygotic.
Prezygotic barriers prevent the formation of a zygote, such as geographic isolation or behavioral differences, while postzygotic barriers prevent the development of viable, fertile offspring, such as hybrid inviability or hybrid sterility. These barriers can occur naturally over time or can be the result of human activities, such as habitat destruction or the introduction of non-native species.
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Question 29 Marks: 1 Common causes of failure of septic tank seepage field systems include improper sizing, nonsuitable soil, nonservicing, andChoose one answer. a. insufficient nutrients in tank b. excessive use of laundry detergents c. leaking fixtures d. use of wetting agents
Common causes of failure of septic tank seepage field systems include improper sizing, non suitable soil, non servicing, and leaking fixtures. Therefore the correct option is option C.
Common causes of failure of septic tank seepage field systems include improper sizing, non-suitable soil, non-servicing, and leaking fixtures.
Leaking fixtures, such as toilets and faucets, can lead to excess water entering the septic tank and seepage field, which can overload the system and cause it to fail.
It is important to address any leaks promptly to avoid damage to the septic system and prevent contamination of the surrounding environment. Therefore the correct option is option C.
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Question 45
Which one of the following is a characteristic of high level nuclear wastes?
a. They don't require shielding
b. They are not hot
c. They generally arise from spent reactor fuel
d. They can be handled with direct human contact
High level nuclear wastes are characterised by the fact that they typically result from spent reactor fuel.
To safeguard people and the environment from the dangers of high level nuclear waste, which is exceedingly radioactive and dangerous, considerable shielding is needed. For thousands of years, it remains dangerously hot, and handling it requires extreme caution. Both the manufacturing of nuclear weapons and the usage of nuclear reactors to generate power are responsible for the waste. Until now, there hasn't been a consensus on how to properly dispose of high level nuclear waste, making it a challenge. High level nuclear wastes are characterised by the fact that they typically come from used reactor fuel. Due to their extreme heat and high radioactivity, they cannot be handled by direct human contact and instead require significant shielding and remote management.
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Mosses produce what type of root like structure?
Mosses produce root-like structures called rhizoids.
These structures are not true roots, as they do not have the same specialized tissues for nutrient uptake and water absorption that true roots have. Instead, rhizoids anchor the moss to the substrate and absorb water and nutrients from the surrounding environment.
Rhizoids are generally single-celled and do not have a protective covering, making them more vulnerable to desiccation than true roots. Despite their limitations, however, rhizoids are crucial for the survival of mosses, as they allow the plants to maintain their position and access the resources they need to grow and reproduce.
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Which objective lens has the smallest visual field?Which one has the highest visual field?
a. Highest magnification lens
b. Lowest magnification lens
The objective lens with the smallest visual field is typically the highest magnification lens, such as the 100x objective lens. This is because higher magnification results in a smaller field of view.
Conversely, the objective lens with the highest visual field is typically the lowest magnification lens, such as the 4x objective lens. This is because lower magnification results in a larger field of view.
Lightweight microscopes have objective lenses that work together with cameras on mobile phones to provide magnification. Using phones with portable microscopes adds the ability to capture magnified images and send them to databases for analysis or store them in the cloud or locally on the phone for future examination.
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Question 12
The primary reason for the decline in the water table in some groundwater dependent areas of the world is:
a. Over-pumping
b. Lack of permeable aquifers
c. High rate of evaporation
d. Low rates of precipitation
The primary reason for the decline in the water table in some groundwater dependent areas of the world is: a. Over-pumping
Over-pumping is the primary reason for the decline in the water table in some groundwater dependent areas of the world. When more water is pumped out of an aquifer than is being naturally replenished, the water table can lower, which can lead to a number of problems such as decreased water availability and degraded water quality.
Over-pumping can be caused by a number of factors, such as population growth, increased agricultural and industrial activity, and climate change. While lack of permeable aquifers, high rates of evaporation, and low rates of precipitation can all contribute to water scarcity in certain areas, over-pumping is the main driver of declining water tables in groundwater-dependent regions.
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A problem with the basic Oparin-Haldane model for the origin of life (though not necessarily an unsolvable one) is that ________.
- it does not explain the origin of chirality
- the early Earth is now not thought to have had a highly reducing atmosphere
- monomers have to be chemically activated before they will polymerize - purine bases can attach to sugars in many equally probable ways
E) All of the above.
A problem with the basic Oparin-Haldane model for the origin of life (though not necessarily an unsolvable one) is (E) All of the above.
Firstly, the Oparin-Haldane model does not explain the origin of chirality, which is the preference for one of two mirror-image molecules in living organisms. Chirality is essential for the proper function of biological molecules, but the model doesn't account for how this preference arose. Secondly, the early Earth is now not thought to have had a highly reducing atmosphere. The Oparin-Haldane model assumes such an atmosphere to produce organic molecules necessary for life, but recent research suggests that the early Earth's atmosphere was not as reducing as initially thought, potentially complicating the formation of organic molecules.
Lastly, the model doesn't address the fact that monomers have to be chemically activated before they will polymerize, and purine bases can attach to sugars in many equally probable ways. These issues make it challenging to understand how the specific sequences required for life could have arisen spontaneously. In conclusion, while the Oparin-Haldane model provides a foundation for understanding the origin of life, it faces several challenges that need to be addressed for a more comprehensive explanation. So the correct answer is (E) All of the above.
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Which word would best describe the operon?(a) respiration(b) transport(c) regulation(d) nutrition
Answer: C
The word that would best describe the operon is (c) regulation.
Explanation:
An operon is a functional unit of DNA in bacteria that consists of a promoter, an operator, and one or more genes that encode for proteins involved in a specific metabolic pathway. The operator regulates the expression of these genes by controlling whether RNA polymerase can bind to the promoter and transcribe the genes. Therefore, the operon plays a crucial role in the regulation of gene expression in bacteria.
Question 36 Marks: 1 Only sperm and nerve cells can apparently replace themselves or recover, to some extent, from radiation exposure if the dose is not excessive.Choose one answer. a. True b. False
True. Only sperm and nerve cells can replace themselves or recover, to some extent, from radiation exposure if the dose is not excessive. So, the correct answer is option a.
This is because sperm and nerve cells have higher concentrations of DNA repair enzymes and antioxidants, which aid in cell repair and radiation damage protection.
Sperm cells can be replaced more quickly than other cells because they have a greater rate of cell turnover. Conversely, nerve cells have a stronger capability for regeneration, which enables them to recover from radiation damage more quickly.
Additionally, nerve cells can more rapidly recover from radiation exposure due to their increased capacity to adapt to changes in their environment.
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Label the structures associated with an intestinal villus.
The structures associated with an intestinal villus include: Epithelial cells, Lamina propria ,Capillaries , Lacteals , Smooth muscle.
Epithelial cells: These are the cells that make up the lining of the intestinal villus. They have microvilli, which are tiny projections on the surface of the cells that increase their surface area and aid in absorption.
Lamina propria: This is a layer of connective tissue that contains blood vessels, lymphatic vessels, and immune cells. It provides support for the epithelial cells and helps to transport nutrients and waste products.
Capillaries: These are small blood vessels that run through the lamina propria and are responsible for absorbing nutrients from the digested food.
Lacteals: These are specialized lymphatic vessels that absorb dietary fats and fat-soluble vitamins.
Goblet cells: These are specialized cells that secrete mucus, which helps to lubricate and protect the intestinal lining.
Smooth muscle: This is a layer of muscle tissue that surrounds the villus and helps to move food through the intestines via peristalsis.
Nerve fibers: These are sensory and motor fibers that control the movement and secretions of the digestive system.
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Part A
Why is it necessary to record the results of carbohydrate fermentation tests no later than 48 hours after inoculation?
During prolonged incubation periods, the carbohydrate supply is exhausted and many bacteria will begin growing oxidatively on the peptones in the broth, altering the color of the pH indicator.
It's necessary to record the results of carbohydrate fermentation tests no later than 48 hours after inoculation because, during extended incubation periods, the carbohydrate supply may be depleted.
This can alter the color of the pH indicator, leading to inaccurate results. Carbohydrate fermentation tests are used to determine whether an organism can ferment a specific carbohydrate. The test involves inoculating a broth containing the carbohydrate with the organism and observing for the production of acid or gas. The presence of acid or gas indicates fermentation of the carbohydrate. However, if the test is not read within 48 hours, the carbohydrate supply may become exhausted, and some bacteria may begin growing oxidatively on the peptones in the broth. This can lead to the production of alkaline byproducts, which can alter the color of the pH indicator and give false-negative results. Therefore, it is important to record the results of carbohydrate fermentation tests no later than 48 hours after inoculation to ensure accurate results. In addition, it is important to follow proper incubation conditions, including temperature and duration, to prevent any changes in the carbohydrate supply and to ensure an accurate interpretation of the test results.
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What is the function of the keratin found within the skin cells?A. Produces vitamin D.B. Prevents water loss.C. Absorbs ultraviolet radiation.D. Sensory perception.
The keratin present in skin cells serves to stop water loss. The insulating, water-repellent layer of skin cells on the body is made of keratin. Option B is Correct.
Melanocytes are the second most common cell type after keratinocytes. The protein that imparts color to the skin, hair, and eyes is called melanin, which is produced by these cells. In addition to blocking UV rays, melanin serves as a barrier for the skin. a particular kind of protein that is present in epithelial cells, which cover both the interior and exterior surfaces of the body.
The tissues of the hair, nails, and epidermis of the skin are all aided in development by keratins. The lining of organs, glands, and other sections of the body also have them on cells. Option B is Correct.
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A woman is a carrier for an X-linked lethal allele that causes an embryo with the allele to spontaneously abort. She has nine children. How many of these children do you expect to be boys?
Answer:
1 Child is expected to be boy.
Explanation:
X generally is a recessive gene so the possibility of the offspring to be a boy comes from the Y gene that carries male gene.
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