Answers
When the two heterozygous parents for tallness are crossed, the F2 generation has three tall and one short plant, with a genotype ratio of 1:2:1 for the TT, Tt, and tt.
What is the Punnett square's significance?The punnett-square significance is that it explains the genotyping of the offspring of the parents, and here there are two parents for the tallness, whereas the tall is dominant over the short, and here there are two types of gametes produced, with three tall and one short, with the punnett-square explained below.
Hence, when the two heterozygous parents for tallness are crossed, the F2 generation has three tall and one short plant, with a genotype ratio of 1:2:1 for the TT, Tt, and tt.
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Related Questions
One year earlier, J. Herbert Taylor's experiments with Vivia faba came to a similar conclusion as this experiment. John Cairns used radioactively-labelled thymidine to explain why heat denaturation in this experiment occurred only with salmon sperm. A density gradient of cesium chloride was used for the ultracentrifugation step in this experiment. This experiment (*) disproved Max Delbruck's dispersive hypothesis. This experiment used E. coli grown on nitrogen-15, followed by growth on
nitrogen-14, and found that three-quarters of the second generation was light. For 10 points, name this experiment that proved DNA replication is semiconservative.
Answers
The Meselson and Stahl Experiment served as a test to demonstrate semiconservative DNA replication. To explore DNA replication, Matthew Meselson and Franklin Stahl performed an experiment in 1958 using the fast-diverging E. coli bacterium.
Who established semiconservative DNA replication?Mathew Meselson and Franklin Stahl established in 1985 that DNA replication is semi-conservative. They carried out their experiment on Escherichia coli bacteria.
How did the Meselson-Stall experiment demonstrate the semi-conservative nature of DNA replication?The semiconservative way of DNA replication is indicated by the lighter strand, which is the new one generated from the culture, and the heavier strand, which stands in for the parents. The replication of DNA in this way proved to be semiconservative.
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TRUE/FALSE. indoor air pollution receives less attention than outdoor air pollution, yet it exerts severe health impacts on millions of people. poverty worsens indoor air pollution in the developing world; high-technology products and chemicals contribute to it in the developed world; and certain lifestyle choices can affect all of us. fortunately, many solutions are within reach to address the causes and lessen the consequences of this environmental health risk.
Answers
True. Indoor air pollution receives less attention than outdoor air pollution, yet it exerts severe health impacts on millions of people.
Air pollution is defined as pollutants of the indoor or outdoor surroundings by any chemical, physical, or biological agent that alters the natural properties of the atmosphere. Common sources of air pollution include household combustion devices, motor vehicles, industrial facilities, and forest fires.
The primary sources of man-made air pollution are vehicle emissions, fuel oils and natural gas used to heat homes, byproducts of industrial production and electricity production, primarily coal-fueled power stations, and fumes from chemical production.
Air pollution is defined as contamination of the indoor or outdoor environment by any chemical, physical, or biological agent that alters the natural characteristics of the atmosphere. Household combustion devices, motor vehicles, industrial facilities, and forest fires are all common sources of air pollution.
Vehicle emissions, fuel oils and natural gas used to heat homes, byproducts of industrial production and power production, especially coal-fueled power plants, and fumes from chemical products are the primary sources of man-made air pollution.
The air pollution sources are numerous. Residential energy for preparing food and heating, automobiles, power generation, agriculture/waste incineration, and industry are the major outdoor pollution sources.
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Why might a scientist use a physical model of a bacterial cell instead of
studying the cell directly?
Answers
Read each question carefully. Write your response in the space provided for each part of each question Answers must be written out in paragraph form. Outlines, bulleted liÅts, or diagrams alone are not acceptable and will not be scored The stems and fruits of pineapple plants contain a group of protein-digesting enzymes collectively called bromelain and often used as an antibrowning agent for fruits and vegetables. Fruits and vegetables brown when they are bruised during transport or sliced and exposed to air. This browning is controlled by enzymatic pathways that produce brown pigments. The browning of fruits and vegetables reduces the nutritional value of the food, so antibrowning agents such as bromelain are used (a) Identify the type of monomer of which this enzyme is composed (b) Bromelain works by breaking the enzymes that cause browning into smaller molecules Explain how the reaction that breaks up the enzymes occurs.
(c) The pH of a solution determines the charge of certain groups. The pH of pineapple fruit ranges from 3.5 to 5.2. Predict the effect on the activity of bromelain if it is used in a product with a pH of 11 (d) Provide reasoning to justify your prediction
Answers
(a) Bromelain is an enzyme, which means that it is composed of proteins. Specifically, it is composed of polypeptides, which are chains of amino acids joined together by peptide bonds.
(b) The reaction that breaks up the enzymes occurs through hydrolysis, which is the process by which bromelain cleaves the peptide bonds between amino acids.
(c) If bromelain is used in a product with a pH of 11, it is likely to have a negative effect on the activity of the enzyme.
(d) The reasoning to justify this prediction is that the pH of a solution determines the charge of certain groups within the enzyme, and changes in pH can alter the shape and conformation of the enzyme. At a pH that is significantly different from the optimal range, the enzyme may become denatured, which means that the specific shape and conformation of the enzyme is altered and the active site is no longer able to bind effectively to the substrate. This can lead to a decrease in the activity of the enzyme.
Bromelain has a specific active site, which is a region on the enzyme that binds to the substrate (in this case, the enzymes that cause browning). The substrate fits into the active site like a key in a lock, and the enzyme then catalyzes the hydrolysis reaction by adding a water molecule to the bond, breaking it apart and releasing the smaller molecules.
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All of the following tools should be used to remove a hair sample from an object except
Osticky tape
tweezers
vacuum
Obrush
Answers
Brush are not used , Hair samples are primarily collected using tools tweezers, trace tapes, and vacuuming. Other methods of hair sample collection include combing and clipping methods.
What methods are employed in the forensic examination of hair?Three main types of hair analysis are conducted by forensic scientists: (1) testing the hair shaft for drugs or nutritional deficiencies in an individual's system; (2) analyzing DNA extracted from the root of the hair; and (3) examining hair under a microscope to determine whether it is from an individual or an animal.
How are hair samples collected?A hair drug test, commonly referred to as a hair follicle drug test, looks for both illicit drug use and prescription drug abuse, a little section of hair cut off of your head for this test. After that, the sample is examined for evidence of drug usage in the 90 days prior to the test.
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Question: What effect does the water temperature have on solution rate? Make a Hypothesis:
Answers
Answer:
Explanation:
Due to the higher energy of motion of the particles, a solute dissolves more quickly in a warmer solvent than it does in a colder one. Another element that influences how quickly a solute dissolves is the temperature of the solvent. The pill will dissolve more quickly if it is dissolved in warm water because some chemicals dissolve more quickly when the temperature is raised.
The processes illustrated in the models depicted above all result in which of the following?
A) Transcription
B) An increase in genetic variation
C) horizontal gene transfer
D) an increase in the chromosome number
Answers
The process illustrated in the figure shows an increase in genetic variation.
The true choice is B
Genetic variation is a variation that occurs in the genome of an organism either in nucleotide bases, genes, or chromosomes. Genetic variation at the basic level is shown by differences in the base sequences of the nucleotides (adenine, thymine, guanine, and cytosine) that make up DNA in cells.
Genetic variation can be caused by several events, namely crossing over, conjugation, mutation, and fertilization. Genetic variation can be one of the factors that influence evolution.
Genetic variation is very influential in evolution because the greater the genetic variation in a population, the greater the chance for that population to adapt to environmental changes and disease.
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The Humoral immune response is a chain reaction of antigens and Interleukins that results in:
A. The production of macrophages to use phagocytosis on pathogens.
B. The differentiation of helper T cells into cytotoxic T cells to destroy pathogens.
C. The swelling of fluid and clotting elements to a damaged area.
D. The differentiation of effector B cells into plasma cells to make antibodies.
Answers
The Humoral immune response is a chain reaction of antigens and Interleukins that results in: The differentiation of effector B cells into plasma cells to make antibodies.
What is meant by Humoral immune response?Plasma cells release antibody molecules, which are the mediators of the humoral immune response. B cells get signals from antigen that attaches to the B-cell antigen receptor, and at the same time, the internalised antigen is processed into peptides that activate armed helper cells.Innate humoral immunity refers to innate immunity that is protein-based. Examples include the body's complement system, interferon, and interleukin-1 compounds (which causes fever). If an antigen manages to get past these barriers, additional immune system components will attack and eliminate it.Infections within cells are stopped from spreading by the humoral immune response, which also destroys extracellular microbes. The reason humoral immunity is so termed is because it uses components present in bodily fluids or humour.Learn more about Humoral immune response refer to :
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Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?a.1:1:1:1b.1:3:3:1c.1:2:2:1d.4:3:2:1
Answers
Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring is 1:1:1:1.
Gene linkage is the proclivity of genes or segments of DNA closely located somewhere along chromosomes to segregate together during meiosis and thus be inherited together.
Gene linkage evaluation is an effective method for determining the chromosomal position of disease genes. It is based on the discovery that genes that are physically close to one another on a chromosome stay connected during meiosis.
Genes that are close enough together on a chromosome will often seem to "stick together," and the variants (alleles) of those genes that are close together on a chromosome will more often than not be inherited as a pair. This is known as genetic linkage or gene linkage.
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The artery that bifurcates into the right subclavian artery and the right common carotid artery is the:
O brachiocephalic artery
O right common iliac artery
O right brachial artery
O right coronary artery
O superior vena cava
Answers
The artery that bifurcates into the right subclavian artery and the right common carotid artery is the brachiocephalic artery
The brachiocephalic artery or brachiocephalic trunk is an artery of the mediastinum that supplies blood to the right arm and the head and neck. It is the first branch of the aortic arch. Soon after it emerges, the brachiocephalic artery divides into the right common carotid artery and the right subclavian artery.
There is no brachiocephalic artery for the left side of the body. The left common carotid, and the left subclavian artery, come directly off the aortic arch. However, there are two brachiocephalic veins. The brachiocephalic artery arises, on a level with the upper border of the second right costal cartilage. The function of Brachiocephalic artery is to bring blood from heart to right arm, head, and neck.
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DRAW IT : The graph here shows the pH difference across the inner mitochondrial membrane over time in an active respiring cell. At the time indicated by the vertical arrow, a metabolic poison is added that specifically and completely inhibits all function of mitochondrial ATP synthase. Draw what you would expect to see for the rest of the graphed line, and explain graph.
Answers
When an ATP synthase is inhibited by a metabolic poison, the H+ concentration in the mitochondrial membrane rises, lowering the pH. As a result, the graphed line decreases gradually, indicating that pH decreases over time.
H+ would be pumped across the membrane into the intermembranous space, increasing the pH difference between the matrix and the intermembranous space. Because H+ cannot flow back through ATP synthase because the enzyme is constricted by the poison, the difference across the membrane will continue to increase rather than remain constant. Eventually, the concentration of H+ in the intermembranous space would become so high that no more H+ could be pumped against the gradient.
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the ability to wiggle your ears is an autosomal recessive trait that does not appear to benefit or harm the people who possess the trait. What is the genotypic ratio
Answers
The ability to wiggle the ears is an autosomal recessive trait that does not appear to benefit or harm the people who possess the trait, and the genotype is ee. E is taken for the ear.
What is the recessive trait?A recessive trait is expressed when two recessive alleles are present together, and in the case of an autosomal recessive trait, there are equal chances of inheritance and character expression in both males and females. In a recessive trait for the wiggle ear, the "E" is taken to represent, so the genotype is "ee," and this trait does not harm the person who inherits it.
Hence, this autosomal recessive trait is expressed as ee.
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Things like your eye color and height are not under your control. This is because they are determined by your genes.
So, eye color is a good example of an inherited
A
height
Bestate
C carbohydrate
D
trait
Answers
A trait that is inherited is the color of the eyes. Both height and eye color are qualities that are influenced by multiple genes.
Which gene affects eye color?ASIP, IRF4, SLC24A4, SLC24A5, SLC45A2, TPCN2, TYR, and TYRP1 are among the genes with known effects on eye color. There is probably a continuum of eye hues in different persons due to the interactions between these genes, OCA2, and HERC2.
Exactly one gene determines eye color?Brown eyes are more prevalent than blue eyes, and eye color has historically been thought of as a single gene feature. At least eight genes have been found to affect the ultimate color of eyes, according to current research. Melanin levels in the specialized iris cells are regulated by genes.
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Which relays instructions from the CNS to muscles more quickly, the somatic nervous system or the ANS? The somatic motor system relays instructions to muscles more quickly because it involves only one motor neuron, whereas the ANS uses a two-neuron chain. Moreover, axons of somatic motor neurons are typically heavily myelinated, whereas preganglionic autonomic axons are lightly myelinated and postganglionic axons are nonmyelinated.
Answers
The somatic motor system relays instructions to muscles more quickly because it involves only one motor neuron, whereas the ANS uses a two-neuron chain. Moreover, axons of somatic motor neurons are typically heavily myelinated, whereas preganglionic autonomic axons are lightly myelinated and postganglionic axons are non myelinated.
The lateral component of the somatic motor system controls the premotor interneurons and motoneurons of the distal muscles. This component consists of two pathways—the lateral corticospinal and the rubrospinal pathways. In humans, the lateral corticospinal pathway subserves the control of the independent movements of the extremities. It controls the motoneurons via direct projections as well as indirectly via strong projections to the laterally located premotor interneurons.
The motoneurons innervating the muscles of the distal limbs receive the strongest direct projections from the motor cortex. This descending system enables humans to make most refined and extremely complex movements, such as independent finger movements and speech, the most complicated motor performance. In most mammals, both the lateral corticospinal and the rubrospinal pathways are important, but in humans the rubrospinal pathway seems to be irrelevant. The somatic motor system relays instructions to muscles more quickly because it involves only one motor neuron, whereas the ANS uses a two-neuron chain. Moreover, axons of somatic motor neurons are typically heavily myelinated, whereas preganglionic autonomic axons are lightly myelinated and postganglionic axons are non myelinated.
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Gastric glands produce _________ and are part of the _______ system.
A. stomach acid, endocrine
B. oily sebum, endocrine
C. oily sebum, exocrine
D. stomach acid, exocrine
Answers
Answer:
Option D
explanation:
Gastric glands produce stomach acid and are part of the exocrine system. The exocrine system is a system of glands that produce and secrete substances directly into ducts that lead to the outside of the body, such as the skin or the digestive tract. Stomach acid is a digestive enzyme that is produced by the gastric glands and secreted into the stomach, where it helps to break down food. Therefore, the correct answer is option D, which states that gastric glands produce stomach acid and are part of the exocrine system.
11. In 1996 the moose population dropped, what then happened to the wolf population in the following
year? Explain why.
Answers
Answer:
Due to the unfortunate loss of the moose population, the wolf population will also drop because primary prey is lost.
Explanation:
When a species becomes extinct or endangered, the life cycle is disarrayed. The butterfly affect is a great example; one factor makes a difference. Without chocolate, there are many recipies one can not make. Without moose, many wolves will starve.
Which two sets of changes are most likely to cause a population to remain stable? • A. Increased births and decreased immigration B. Increased deaths and decreased immigration • C. Increased births and increased deaths • D. Increased emigration and decreased births
PLEASE ANSWER THIS IS FOR MY FINAL EXAM
THANK YOU
Answers
Answer:
A population is considered stable when the number of births and deaths is roughly equal, and the number of individuals entering and leaving the population is also roughly equal. Therefore, the two sets of changes that are most likely to cause a population to remain stable are:
Increased births and increased deaths
Increased emigration and decreased immigration
It is worth noting that a population can also remain stable if there is a balance between the number of individuals entering and leaving the population, regardless of the birth and death rates.
Explanation:
the DNA sequence "TAC GGT CAG AAG ATT" will transcribe the mRNA codon sequence ___ ___ ___ ___ ___
Answers
The DNA sequence "TAC GGT CAG AAG ATT" will transcribe the mRNA codon sequence AUG CCA GUC UUC UAA, which is then used according to the genetic code to create the protein.
What is the genetic code?The genetic code is a series of instructions in order to synthesize a protein from a given chain of triplets of nucleotides or codons which serve to add specific amino acids to the growing polypeptide chain.
Therefore, with this data, we can see that the genetic code is sued to indicate which triplet of nucleotide or codon will specify a given amino acid.
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shown below are several molecules found in animal cells, along with their mass in daltons. based on the data gathered by loewenstein, et al. which molecule(s) would be excluded from moving through gap-junction channels? molecule approximate mass (daltons) histidine (an amino acid) 100 carnosine (a dipeptide) 226 thyroid-releasing hormone (trh, a peptide hormone) 360 atp 551 insulin (a peptide hormone) 5808 hexokinase (an enzyme) 50,000
Answers
Molecules that would be excluded from moving through gap-junction channels are insulin and hexokinase.
Connexins, a family of proteins articulated for most tissues of an organism, form gap junction channels.
Gap junction channels allow ions and other small molecules to pass between contacting cells, synchronizing them both electrically and metabolically. Gap junction channels are highly specialised intercellular connections that connect a wide variety of animal cell types. They connect the cytoplasm of two cells directly, allowing molecules, ions, and electrical impulses to transfer through a governed gate between cells.
Hexokinase is the first glycolytic enzyme, potentiating the phosphorylation of glucose by ATP to glucose-6-P. It is one of the glycolysis rate-limiting enzymes. As regular red cells age, their activity decreases rapidly.
Insulin is a peptide hormone created by pancreatic islet beta cells and encoded by the INS gene in humans. It is thought to be the body's primary anabolic hormone. Hexokinase is a potential insulin regulatory site that is irregular in insulin resistance. The modified regulation of hexokinase may play a significant role in the diminished insulin-mediated glucose flow rates in insulin-resistant skeletal muscle.
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if two cells have different scaffolding proteins, explain how they might behave differently in response to the same signaling molecule.
Answers
If two cells have different Scaffolding proteins, they handle molecular elements of signaling pathways together in a complex. Various Scaffolding proteins would combine afferent protein collections, resulting in distinct cellular responses in the two cells.
Scaffolding proteins, as the name suggests, combine two or even more proteins in a comparatively stabilized configuration. There are numerous Scaffolding proteins found in nature, many of which have multiple protein-protein interaction modules.
The influence of a chromosome on Scaffold comprising non-histone proteins, known as Scaffolding proteins, has been the most significant structural discovery.
the proteins in a signaling pathway that connect with multiple cells. Based on the results of the analysis, 212 proteins were identified as Scaffolding proteins with statistical importance.
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the distribution of heights of adult men is approximately normal with a mean of inches and a standard deviation of inches. bob's height has a -score of when compared to all adult men. which of the following is true?
Answers
Answer: Bob is shorter than 69 inches tall
Explanation:
1. I took the quiz and 2. Bob's height has a Z-score of -0.5 when compared to all adult men.
Could the biological, psychological, and sociocultural factors behind psychological disorders all be correct, or is there only one factor that dominates
Answers
In psychological disorders, the biological, psychological, and sociocultural factors are all correct.
What are psychological disorders?Psychological disorders are disorders that affect the thought process of an individual.
Psychological disorders are all a combination of biological, psychological, and sociocultural factors.
The biological factors that are involved include the structure of the body organs especially the brain and other related organs and tissues. For example, when lesions occur in the brain, it could lead to psychological disorders.
Psychological factors are those factors that are not physical factors but affect the mind and emotions.
Sociocultural factors are the environmental factors that affect an individual.
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What is the speed of a wave if it has a wavelength of 12 m and a frequency of 3 hertz?
Answers
Answer:
The speed of a wave is 36 m/s
Explanation:
Given;Wavelength (λ) = 12 mFrequency (f) = 3 Hz or s⁻¹To Find;Speed (v)So,
v = λ × f
v = 12 × 3
v = 36 m/s
Thus, The speed of a wave is 36 m/s
- Most incidental motions:
may be debated after they are amended.
are always debatable.
are not debatable
may be debated if permission is granted.
Answers
Answer:
are always debatable.
Label the parts of the neuron:
Axon, axon bulb, axon hillock, dendrite, myelin/Schwann cell, nucleus, node of Ranvier
A.
B.
Answers
nucleus in A B. axon Axon Hillock, C. Myelin D Dendrite E. Node of Ranvier, F. axon bulb G
Where does the axon hillock of a neuron reside?Its axons hillock, which is located close to the soma's end, controls how the neuron fires. If the total strength of a signals is greater than the threshold limit of the axon hillock, the construct will discharge a signal known as an excitable cells down the axon.
What opens at the axon hillock?At threshold voltage, voltage-gated sodium ions in the axon hillock open. The axon hillock contains a relatively high density of voltage-gated sodium channels, which are responsible for generating the action potential.
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which statement about bacteria is false? consumption of even a few bacterial cells can cause food-borne illnesses. most environmental bacteria are harmless. bacteria are present on most surfaces in our homes. some bacteria are beneficial.
Answers
Answer: A: Consumption of even a few bacterial cells can cause food-borne illnesses
Explanation:
Which statement about bacteria is FALSE?
a) Consumption of even a few bacterial cells can cause food-borne illnesses
.b) Most environmental bacteria are harmless.
c) Bacteria are present on most surfaces in our homes.
d) Some bacteria are beneficial.
I took the test :3
Imagine you are a paleontologist trying to find the “missing link” between different species. In three to five sentences, create a fictional narrative about your discoveries, describing: 1) what two species, mythical or real, you are studying, 2) what evidence you have linking these species, and 3) what evidence you have to define different correlations and causations that support your hypothesis.
Answers
T/ F
The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.
Answers
The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place. Reflexes are rapid, automatic responses to stimuli. Efferent nerve fibers may be described as motor nerve fibers.
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which of the following crosses will not produce offspring with the recessive phenotype? select all that apply. a.tt x tt b.tt x tt c.tt x tt tt x tt d.tt x tt
Answers
The answer is (C). TTxTt, the other crosses will produce at least one offspring of recessive phenotype.
Punnett squares must be drawn in order to determine the probability and what happens to all the children.
The dominant trait is denoted by T, and the recessive by t.
TT x tt = Tt Tt Tt Tt = 100% Tt
The dominant allele will be present in every single offspring.
Tt x Tt = TT Tt tT tt =25% TT 50% Tt 25% tt
In this case, there is a 25% chance that the progeny will carry the recessive allele.
TT x TT = TT TT TT TT= 100% TT
The dominant allele will be present in every single offspring.
Tt x tt = Tt tt tt tt = 25% Tt 75% tt
In this case, there is a 75% likelihood that the progeny will carry the recessive allele. Thus TT x Tt will have the recessive phenotype in the offspring.
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The correct question is:
Which of the following will not produce offspring with the recessive phenotype?
Select one:
a. tt x tt
b. Tt x tt
c. TT x Tt
d. Tt x Tt
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Artificial selection (chosen by person) and natural selection (best changed in the environment) differ in one major way- the forces that select which organisms are able to survive and reproduce. How are these processes different?
a. In natural selection, the organisms best adapted to survive in the environment are more likely to reproduce and pass on their traits, while in artificial selection, humans choose which organisms survive and reproduce.
b. In natural selection, humans choose which organisms survive and reproduce, while in artificial selection, the organisms best adapted to survive in the environment are more likely to reproduce and pass on their traits.
c. In natural selection, both the humans and the environment choose which organisms survive and reproduce, while in artificial selection technology chooses which organisms survive and reproduce.
d. In natural selection, technology chooses which organisms survive and reproduce, while in artificial selection, humans and the environment choose which organisms survive and reproduce.
I think it is A, but I believe two heads are better than one. So, check my answer pelase
Answers
The way that the processes of artificial and natural selection are different are: a. In natural selection, the organisms best adapted to survive in the environment are more likely to reproduce and pass on their traits, while in artificial selection, humans choose which organisms survive and reproduce. Option A
What is meant by artificial selection?Individual organisms with certain phenotypic characteristic values are chosen for breeding through a method called artificial selection. If the chosen characteristic exhibits additive genetic variation, it will respond to selection and change over time.
Because humans (rather than nature) choose which creatures get to reproduce, this process is referred to as artificial selection. The image below demonstrates how farmers have artificially selected for certain traits to develop several crops from wild mustard.
Artificial selection is directed by human preferences and differs from natural selection in that it is not random.
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