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Ch. 23 - Evolutionary Processes
All textbooksFreeman 8th EditionCh. 23 - Evolutionary ProcessesProblem 7
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Chapter 22, Problem 7

Determine what is incorrect in the following statement: Deer mice living on beaches mutated their genes so that they could have white fur color, providing better camouflage to survive on beaches.

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Hello everyone and welcome to today's video. In today's video we have which of the following types of alleles can be produced by mutations which are evolutionary process. So remember that a mutation is a change in the DNA sequence which can affect for example the code and that code for specific amino assets that then form proteins. So let's say that this change change is one of the nucleotides in the code on by something else. These are what the mutations usually do. So now there are many things that can arise from amputation and it really depends to what this has changed too. So for example, let's set different examples so that we can solve the problem. Let's say that the mutation changes this nucleotide a by another nuclear side which is the same nuclear side. This is going to have no effect on the protein or on the a leo because the same thing is going to be obtained. So it is going to have a neutral effect which is answer choice B. So this is actually a correct answer choice. But let's say that the mutation changes nucleotide by nucleotide be or it changes the protein function in some way. Now there is to just major consequences that can arise from this. It can either have a beneficial effect. Let's say that now the organism is able to run 100 mph because this protein was affected in that way, which is going to be answer choice a or it can have dangers or a deleterious effect. Let's say that the organism needed that protein in order to let's say, breathe. And now, since the protein was changed and affected, the organism can breathe anymore. So now this is very bad for the organism as it could potentially die. So this is actually a correct answer choice as well. Since all of these answer choices are correct, we're going to select answer choice D all of the above as the final answer to a question. I really hope this video helped you, and I hope to see you on the next one.
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Textbook Question

In a population of 2500, how many babies would you expect to have cystic fibrosis, a homozygous recessive condition, if the frequency of the dominant allele is 0.9 and the population is at Hardy–Weinberg equilibrium? a. 0.9×2500=2250 b. 2×0.9×0.1×2500=450 c. 0.9×0.1×2500=225 d. 0.1x0.1x2500=25

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Explain why continuous growth enhances the phenomenon known as phenotypic plasticity.

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Open Question

Melissa Kemp is a conservation paleobiologist who studies how biodiversity has changed (and is changing) over time by integrating paleontology and genetics. She has studied how lizards in the Caribbean have evolved in response to changing ecological factors, including climate change. In one of her studies, Kemp identified that larger lizards were less likely to survive than smaller lizards. (1) Propose a hypothesis for what evolutionary mechanism could lead to this observation. (2) How could anthropogenic climate change potentially accelerate these evolutionary changes?

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Textbook Question

Draw a small concept map showing how selection, genetic drift, gene flow, and mutation relate to genetic variation.

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Textbook Question

In humans, albinism is caused by loss-of-function mutations in genes involved in the synthesis of melanin, the dark pigment in skin. Only people homozygous for a loss-of-function allele (genotype 𝑎𝑎) have albinism. In one study of an American population, individuals with albinism were present at a frequency of about 1 in 10,000 (or 0.0001). Assuming that genotypes are in Hardy–Weinberg Equilibrium, what is the predicted frequency of individuals who are carriers (that is, 𝐴𝑎) for the albinism allele?

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