The main dietary component in the growth of dental decay caries is free sugars. When oral bacteria break down glucose to create acid, which demineralizes the hard structures of the teeth, dental caries is created (enamel and dentine).
As part of its metabolism, the anaerobic bacteria S. mutans is known to create lactic acid. Second, S. mutans can adhere to tooth surfaces when there is sucrose present because it produces glucans, a polymer that helps to attach the bacteria to the tooth. Dental decay is caused by acids produced by bacteria that digest sucrose and other dietary carbohydrates, which dissolve tooth mineral, chiefly hydroxyapatite, Ca10 (P04)6(0H)2. These microorganisms are found in dental decay plaque, a buildup of bacteria on the tooth's surface.
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prokaryotes divide by binary fission, a form of asexual reproduction in which?
Answer:
Prokaryotic cells can reproduce asexually only through binary fission. Binary fission is the process by which a bacterial cell splits into two identical daughter cells. This is a very fast process and contributes to the rapid growth and replication of bacteria.
Explanation:
Answer:
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this ecg indicates an issue with which electrical node(s) and/or mechanical event(s)? (select all that apply). a. sinoatrial node b. ventricular systole c. atrial relaxation d. atrial depolarization e. purkinje fibers f. atrioventricular node
Option A, B, E,F; sinoatrial node,ventricular systole,purkinje fibers and atrioventricular node all indicate an issue with electrical and/or mechanical events.
Specialized pacemaker cells in the heart initiate the electrical depolarization and repolarization sequence. The term "inherent rhythmicity" or "automatity" refers to this characteristic of heart tissue. The atrioventricular node (AV node), the bundle of His, the right and left bundle branches, and Purkinje fibers are some of the conducting channels through which the electrical signal, which is produced by the sinoatrial node (SA node), spreads to the ventricular muscle.
The contractile cells constrict when the electrical signal of a depolarization reaches them. The cardiac cells relax when the repolarization signal reaches them. Thus, the mechanical heart beating is a result of electrical signals. The SA node starts each electrical and mechanical cycle as the heart's natural pacemaker. The electrical impulse that travels through the atrial muscle as the SA node depolarizes causes the muscle to contract.
Atrial contraction follows the depolarization of the SA node as a result. The internodal fibers also allow the SA node impulse to reach the atrioventricular node (AV node). (Because of the nonconducting tissue dividing the atria and ventricles, the wave of depolarization does not immediately extend to the ventricles.) When the atria contract, the electrical signal is delayed in the AV node for around 0.20 seconds before being transmitted to the ventricles by the Purkinje fibers, right and left bundle branches, and bundle of His.
The electrical impulse is transmitted directly to the ventricular muscle by the Purkinje fibers, which causes the ventricles to contract (ventricular systole). Additionally, the atria and ventricles undergo repolarization of the SA node, kicking off the relaxation phase (ventricular diastole).
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the half-life of a pesticide determines its persistence in the environment. a common pesticide degrades in a first-order process with a half-life of 4 days. what fraction (in decimal notation) of the pesticide remains in the environment after 10 days? enter to 4 decimal places.\
the half-life of a pesticide determines its persistence in the environment. a common pesticide degrades in a first-order process with a half-life of 4 days. 0.176 fraction (in decimal notation) of the pesticide remains in the environment after 10 days, enter to 4 decimal places.\
No of half lifes (n) = total time / half life
n= 10/4 = 2.5
Amount of pesticide remains = Ao(1/2)n
Ao is the initial amount
Amount left = Ao(1/2)2.5= Ao(00176)= 0.176 Ao
If we assume Ao=1
Then Amount left = 0.176
A chemical substance's ability to exert negative effects and travel to distant areas can be enhanced by its environmental persistence, which is a crucial feature. The pace of biological and chemical processes, such as photolysis, atmospheric oxidation, hydrolysis, and biodegradation, that remove organic substances from the environment determines how long they remain in the environment.
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witch curve shows the reaction pathway with the enzyme
Answer:
In the presence of an enzyme, the course of the reaction is shown by the red curve.
what is the chance that among the three children in generation ii who have the dominant phenotype, one of them is aa and two of them are aa ? (hint: consider all possible orders of genotypes.)
The other three children are having dominant phenotype but only one among them is homozygous dominant. The chances of the child becoming AA is 0.25 and that of Aa is 0.50.
The phrases homozygous and heterozygous are used to characterize allele pairings. Homozygous people have two copies of the same allele (RR or rr). Individual organisms with several alleles (Rr) are referred to as heterozygous. Those who have the genotypes AA and aa are homozygotes (i.e., they have two copies of the same allele). Genotype Aa individuals are heterozygotes (i.e., they have two different alleles at the A locus).An organism is considered to be homozygous dominant if it carries the same dominant allele in two copies, and homozygous recessive if it carries the same recessive gene in two copies. If a gene has two different alleles, an organism is said to be heterozygous. Homo- means the same, but hetero- denotes difference. A specific zygote type is referred described as being -zygous.
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marine ecosystems provide important ecological services including . group of answer choices releasing energy from tides moderating the climate being the sources of minerals releasing co2 providing transportation
Marine ecosystems provide important ecological services such as;
releasing energy from tidesmoderating the climatebeing the sources of mineralsreleasing CO₂providing transportationWhat are marine ecosystems?Marine ecosystems refer to the ecosystems that are found in water bodies that contain minerals dissolved in high concentrations.
These water bodies are known as seawater and they include oceans and seas.
Ecological services from an ecosystem are those services or benefits that are derived from a particular ecosystem.
The marine habitat contains the largest number of living organisms such as fishes, crabs, and other marine mammals.
The marine ecosystem also contains the largest volume of water as well as deposits of minerals like calcium.
The marine ecosystem is also the largest reservoir of carbon (iv) oxide, CO₂.
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Where are the instructions that tell the cell everything it needs to survive?
Apricots, butternut squash, cantaloupe, carrots, mangoes, peaches, pumpkin, and sweet potatoes are rich in.
Apricots, butternut squash, cantaloupe, carrots, mangoes, peaches, pumpkin, and sweet potatoes are rich in Beta-carotene.
Beta-carotene is a pigment observed in flora that offers them their caseation. The call beta-carotene is derived from the Latin call for carrot. It offers yellow and orange culmination and greens their wealthy hues. Beta-carotene is likewise used to caseation ingredients consisting of margarine.
In the frame, beta-carotene converts into nutrition A (retinol). We want nutrition A for true imaginative and prescient and eye health, for a robust immune system, and for wholesome pores and skin and mucous membranes.
Taking large doses of nutrition A may be toxic, however your frame most effective converts as an awful lot nutrition A from beta-carotene because it needs. That method beta-carotene is taken into consideration a secure supply of nutrition A.
However, an excessive amount of beta-carotene may be risky for folks that smoke. Getting excessive quantities of both nutrition A or beta-carotene from food, now no longer from supplements, is secure.
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You are studying a gene that, when mutant, causes oligodendrocytes to enwrap sections of axon so that nodes of ranvier are more closely spaced. What is the likely effect on nerve impulses?.
A gene that when mutant, causes oligodendrocytes to enwrap sections of axon so that nodes of ranvier are more closely spaced will make the nerve impulses travel slower.
What is a gene?
A gene is the fundamental physical and functional unit of heredity. A gene is made up of DNA. Some genes but not all genes are also responsible as instructions for producing molecules known as proteins. About twenty thousand to twenty five thousand genes varying in different sizes are thought to be present in humans.
Every gene is present in two copies in every person, one from each parent.
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13) What are the 5 ELEMENTS found in DNA and other Nucleic acids, like RNA?
Answer:
Nucleic acids contain the same elements as proteins: carbon, hydrogen, oxygen, nitrogen; plus phosphorous (C, H, O, N, and P). Nucleic acids are very large macromolecules composed of repetitive units of the same building blocks, nucleotides, similar to a pearl necklace made of many pearls.
The body needs glucose from carbohydrates for major organs and tissues. If dietary carbohydrates are inadequate, the body utilizes other sources to provide energy. What is the only source that can not be used to directly make glucose?.
Glucose cannot be synthesized from fatty acids.
Glucose can not be made using fatty acids or ketogenic amino acids. As acetyl-CoA cannot be transformed back to pyruvate due to the one-way nature of the transition reaction, it cannot be used as a fuel.
Since pyruvate and other molecules with at least three carbon atoms are required for the body's enzymes to function in an energetically advantageous manner, acetyl CoA cannot be converted to glucose since it possesses a two-carbon acetyl group. This indicates that the Krebs cycle will continue to break down acetyl-CoA.
Fatty acids cannot be turned into glucose because they produce acetyl coenzyme A (CoA), which enters the citric acid cycle and is oxidized to carbon dioxide (CO₂).
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What could be the right answer for this question?
The following traits represent color blindness as an X-linked trait. Option D.
Most people who are colorblind cannot distinguish between certain shades of red and green. Very rarely colorblind people cannot distinguish between shades of blue and yellow. Certain eye diseases and some medications can also cause color blindness. Color blindness is caused by a lack of color-sensing pigments in the cones of the retina, the neural layer at the back of the eye.
People who are colorblind have difficulty seeing red green blue, or mixtures of these colors. The different types of abnormal conditions include protanomalies, which are insensitive to red light deutenomalies which are insensitive to green light the most common form of colorblindness, and tritanopia which is insensitive to blue light. Marie very rare is there.
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Which type of monomer includes atoms of carbon, hydrogen, oxygen,
nitrogen, and phosphorus?
OA. Nucleotide
OB. Monosaccharide
OC. Fatty acid
OD. Amino acid
Answer: A. Nucleotide
Explanation: The type of monomer that includes atoms of carbon, hydrogen, oxygen, nitrogen, and phosphorus is a nucleotide. A nucleotide is an organic molecule that is composed of a nitrogenous base, a five-carbon sugar (ribose or deoxyribose), and at least one phosphate group. They are the monomers that are used to build nucleic acids such as DNA and RNA. Nucleotides are essential components of the genetic material and are responsible for the storage, transmission, and expression of genetic information.
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five different species of warblers, seed-eating birds, live in the same species of conifer trees. all of the birds migrate to coniferous forests during the summer, and different species reside in different areas in the same tree. they feed on the seeds of the conifer trees, but the different species do not mate with each other.
Resource partitioning of the seeds reduces competition, and the five different species can live in the same tree. Thus option C is correct.
What are migrating birds?Migrating birds are defined as the regular seasonal movement of birds between breeding and wintering grounds, often north and south along a flyway.
The various species of warblers, which are seed-eating birds, live in coniferous trees and are all migratory birds. They both feed on tree seeds and live in similar environments. They are all non-residents due to their distinct migration patterns.
According to the passage, the seeds' resource partitioning reduced competition, and the five diverse species can coexist in the same environment.
Thus, Resource partitioning of the seeds reduces competition, and the five different species can live in the same tree. Thus option C is correct.
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Your question is incomplete, but probably your complete question was
Five different species of warblers, seed-eating birds, live in the same species of conifer trees. All of the birds migrate to coniferous forests during the summer, and different species reside in different areas in the same tree. They feed on the seeds of the conifer trees, but the different species do not mate with each other. Which of the following best explains why the different warbler species can all have habitats in the same conifer trees?
a. Not all the warblers are residents in the forest at the same time of the year because of different migration patterns.
b. Physiological differences in beak structure allow the warblers to consume different species of seeds through symbiotic relationships.
c. Resource partitioning of the seeds reduces competition, and the five different species can live in the same tree.
d. Niche overlap occurs between the five different species, and living in the same tree increases competition for seeds.
Please answer the question in the photo! (will mark Brainliest if correct)
Option 4 is correct - your kidney controls the water level through nephron tubes whenever you have low amounts of water that have been detected in your blood.
Because of drinking less water in a day, we experienced faintness and weak which led to the condition of dehydration. In this situation, saving a single drop of water becomes crucial for our body to survive.
Here, the Kidney plays the role of hero and controls the water level of the body using the hormone ADH (Antidiuretic hormone) released by the Pituitary gland.In a time of dehydration, the kidney starts absorbing more water into the nephron tubes which resulted in less urine production.After the detection of the low amount of water, these signaled enzymes, pump salts into nephron tubes because of the presence of more salt than usual which need to be balanced out by water.Therefore, Option 4 is correct.
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What are the names of these two sedimentary rocks?
Pls help? Ty <3
5. Modern houses have systems to control internal air temperatures in times of very cold or hot weather. In these homes, hot or cool air is pumped into the interior of the house to help keep the temperature comfortable. Based on what you know about how cool and warm air circulate in the atmosphere, what might an engineer need to consider when designing a heating/cooling system for a home in a cooler climate? How might the design differ for a house found in a warmer climate?
6. How does the density of air affect its movement in a convection cell?
7. Why does the wind tend to blow from over the water to over the land on a sunny day?
8. Which statements are true about why wind tends to blow from over the water to over the land on a sunny day? Highlight all the statements that apply.
A. Air over the water is cooler than air over the land is.
B. The air above the land has greater density.
C. The wind is caused by differences in density.
D. Cool, dense air from over the water flows toward the land, pushing warm air upward.
An engineer need to consider a heat pump system for a home in a cooler or warmer climates. Also, wind tends to move over the water because air over the water is cooler than air over the land is. Therefore, option A is correct.
Heat pumps offer an energy-efficient alternative to furnaces and air conditioners for all climates. They keep your house warmer in cooler climates and cooler in warmer climates. Therefore, an engineer must consider hest pump systems while designing a house.
The unequal heating of the Earth by the sun results in wind, which is the movement of air. The land is warmed by the sun more rapidly than the sea. An inland breeze is produced when warm air above the land rises and cooler air above the water moves in over the land.
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In Florida, daytime and nighttime temperatures usually only differ by 5 to 10°C, while temperatures in the desert often differ by as much as 40°C. What role does water play in
keeping temperatures in Florida from fluctuating dramatically?
A. Evening rain brings heat from the upper atmosphere back to Earth.
B. Bodies of water store heat during the day which cools the land nearby.
C. Humid air releases heat as it rises, keeping temperatures constant.
D. Water has a high heat capacity that helps regulate the temperature of the surrounding area.
The role does water play in keeping temperatures in Florida from fluctuating dramatically is that water has a high heat capacity that helps regulate the temperature of the surrounding area.
What is the role of specific heat of water?It has been scientifically proven that the specific heat of water is higher than any other substance. This means that if the water is present in any environment, it will have the capacity to absorb more heat as compared to the area where no water is present. Further, water absorb heat during hot climate and then releases back during cold climate.
This is the reason that, in Florida, where water is present, fluctuation in the temperature are only 5 degrees Celsius. On the other hand, in the desert, no water is present and thus fluctuations in temperature are high and can be directly linked to the presence and absence of sunlight during day and night along with other environmental parameters.
Therefore, The role does water play in keeping temperatures in Florida from fluctuating dramatically is that water has a high heat capacity that helps regulate the temperature of the surrounding area.
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5. Maintained by nervous and chemical control.
A. Respiration B. Reproduction C. Excretion D. Regulation
6. The guard cells of a plant leaf swelling shut to prevent water loss. This
keeps the plant hydrated and prevents dehydration.
A. Respiration B. Nutrition C. Homeostasis D. Growth
7. In plants glucose is converted to a large sugar molecule known as
cellulose. In humans, glucose is converted to a large sugar molecule
known as glycogen and stored in the liver. What life function describes
these processes?
A. Growth B. Nutrition C. Homeostasis D. Synthesis
8. The life process which converts chemical energy into a usable form.
A. Reproduction B. Respiration C. Synthesis D. Homeostasis
9. In which process are simple materials chemically combined to form more
complex materials?
A. Respiration B. Reproduction C. Nutrition D. Synthesis
Respiration, excretion , regulation , respiration, homeostasis, growth are maintained by Nervous system.
What what is a neurological system?The brain, spinal cord, and an intricate web of nerves make up the nervous system. The brain and the body communicate with one another through this system. All bodily processes are under the control of the brain. The spinal cord exits the brain through the back and descends.
Nutrition , growth , homeostasis, synthesis all are life functions. Respiration , synthesis , respirations are simple materials to chemically combined to form more complex materials.To learn more about Neurological system refer
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In the Northern Hemisphere, climate scientists observe seasonal changes in carbon dioxide concentration with the highest levels measured in May and the lowest levels measured in October. Hypothesize how photosynthesis can affect these changes. Explain your answer in three to five sentences
A plausible hypothesis associated with seasonal changes in carbon dioxide concentration being the highest levels measured in May and the lowest levels measured in October is that the rate of photosynthesis will be higher in May because carbon dioxide is a reactant.
What is the rate of photosynthesis?The rate of photosynthesis refers to the amount of photosynthetic products that are generated in a given unit of time, which are generally measured as units of biomass both for plants and algae.
The rate of photosynthesis depends on the presence of reactants for this process which includes sun light and also carbon dioxide, which is a fundamental substance in order to produce carbohydrates during this process.
Therefore, with this data, we can see that carbon dioxide is a reactant of photosynthesis and therefore its concentration is fundamental to carry out this process.
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If the conservative model had been correct, how many generations of bacterial cell division would have had to pass before meselson and stahl would have observed evidence of a band in the cscl gradient corresponding to a hybrid dna molecule containing both 14n and 15n?.
DNA from the first generation has strands that are 15N/14N,One form of DNA in the second generation contains 15N/14N strands, whereas the other type has 14N/14N strands.
Explanation:
One strand of the parental type and another newly generated strand that is formed during DNA replication are both present in the newly formed dsDNA after replication. Semi-conservative DNA replication uses two strands, one of which is paternal and the other fresh.
E. coli was cultured on 14N media and already has DNA that has been tagged with 15N and 15N.Accordingly, during DNA replication, the first generation contains hybrid 15N/14N DNA, wherein one strand (15N) is inherited from the parents and the other (14N) is freshly generated, and the second generation has both hybrid 15N/14N DNA and 14N/14N DNA. It was not possible to find any DNA with 15N/15N strands.
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Scientific Argument 4.1 claim 2
Arguments are human artefacts; they are examples of human invention. Contrary to appearances, arguments are artefacts in the same sense that a computer is. Humans produce arguments for specific goals, just like all other things. Additionally, arguments have sciences devoted to comprehending their operation and enhancing their production, similar to many other objects. The formal logic, probability theory, and statistics of arguments are analogous to those of computer science for computers. In other words, one should approach arguments in the same way that they would any other tool or artefact.
What is scientific argument?
People are considered to be involved in a scientific argument when they disagree on scientific explanations (claims) and back up their positions with concrete evidence. Researchers employ a strategy to guide their work called a scientific argument. Scientists criticise the shortcomings and limitations of other people's arguments in order to ultimately enhance scientific explanations and experimental methods. This method is known as "arguments supported by evidence."
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in the last few decades, the use of antibiotics and antibacterial cleaning products has increased. what consequences are being seen now as a result of the overuse or misuse of antibiotics?
consequences of the overuse or misuse of antibiotics.
Sir Alexander Fleming first mentioned the issue of antibiotic misuse in 1945 when he predicted that "the public would desire [the medicine] and thereafter usher in an era of excesses." Antibiotic usage undoubtedly promotes the emergence of resistance. Epidemiological research has shown a link between the use of antibiotics and the establishment and spread of resistant bacterial species. Genes in bacteria can be inherited from close relatives or acquired from unrelated individuals via mobile genetic components like plasmids. Through this horizontal gene transfer (HGT), antibiotic resistance may spread between several bacterial species.Additionally, resistance can evolve on its own through mutation. Drug-sensitive rivals are eliminated by antibiotics, leaving drug-resistant microorganisms remaining to proliferate through natural selection. Worldwide, antibiotics are overprescribed despite warnings against overuse.To know more about Antibiotic visit : https://brainly.com/question/17988226
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in true experiments, is to dependent variable as is to independent variable. a. measuring; manipulating b. controlling; manipulating c. recording; measuring d. manipulating; measuring
In every true experiment, a researcher modifies an independent variable in order to affect one or more dependent variables.
What is a dependent variable?In an experiment, the effects of changing the independent variable are tracked. Dependent variables are those observed effects. They are frequently the anticipated result of changing the independent variable. The independent variable determines how the dependent variable changes, thus the name. When performing experiments, researchers aim to quantify the link between the dependent and independent variables.
What is the difference between independent and dependent variables?The cause is the independent variable. Its value is unaffected by other study variables.
Effect is the dependent variable. Changes in the independent variable affect its value.
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Choose all that apply
Answer:
plasmids
b/c it can't have those 4 things
During pcr, where does the energy come from that adds the nucleotide to the growing dna strand?.
During pcr, the energy comes from the incoming nucleotides, that adds the nucleotide to the growing dna strand.
What are nucleotides?
An biological molecule known as a nucleotide has the fundamental building blocks of a nitrogenous base, pentose sugar, and phosphate.
As polynucleotides, DNA and RNA are composed of a chain of monomers with various nitrogenous bases. The execution of metabolic and physiological processes requires nucleotides.
Adenosine triphosphate, or ATP, serves as the energy standard for cells. Numerous metabolic activities require nucleotides, which combine to generate a variety of coenzymes and cofactors such coenzyme A, NAD, NADP, and others.
Therefore, the energy that adds the nucleotide to the growing Dna strand comes from the incoming nucleotides.
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If the dna content of a diploid cell in the g1 phase of the cell cycle is x , then the dna content of the same cell at metaphase of meiosis i will be.
If DNA content of a diploid cell in the g1 phase of the cell cycle is x , then DNA content of the same cell at metaphase of meiosis I will be double that is 2X
The DNA content is duplicated after G1 PHASE IN S phase therefore DNA content during the meiosis I would double that is 2X.
The DNA content of a cell in the G1 phase is 2N, known as diploid. DNA content of a cell in the G2 phase is 4N that is tetraploid. The DNA content of a cell in the S phase varies between 2N and 4N depending completely on the stage of cell replication.
14 chromosomes are present in G1phase initially. In S phase, there is no change in number of chromosomes. Therefore, 14 chromosomes is present again. There is no change at the beginning of M phase.
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easynotecards which model of the lac operon correctly shows rna polymerase, lactose, and repressor protein when the structural genes are being transcribed?
Model B shows lac operon model which correctly shows RNA polymerase, lactose, and repressor protein when the structural genes are being transcribed.
For the transport and metabolism of lactose in E. coli and other bacteria, the lac operon is an operon, or a collection of genes, with a single promoter.
The Lac Operon model may be used to describe how prokaryotic genes are regulated. Here, it is possible to see how changes in physiology and the environment affect prokaryotes' ability to express certain genes. Monod and Jacob were present and saw it.
The regulatory gene generates repressor protein that binds to the operator when inductor lactose is absent. We can thus rule out all the other models in the possibilities based on this. The picture that is attached shows the illustration.
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Question correction is attached below:
Color-blindness is a recessive x-linked trait. If a color-blind female is and a normal-sighted male have children, what percent of the biologically male offspring will be colorblind?.
Answer:
Most commonly, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance. As a result, the condition tends to affect males more often than females (8% male, 0.5% female).
Explanation:
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Which one of the following is NOT part of the Cell Theory?
Group of answer choices
The cell is the basic unit of life for living organisms
All cells contain a nucleus
All cells come from existing cells
All living organisms are composed of one or more cells