Question

why do genetically identical organisms sometimes look different?

a dna changes dramatically after childhood

b they do not consume enough nutrients to show their genes

c environmental conditions affect how genes are expressed

d mutations always occur during development

question 5
why do rabbits raised at different temperatures have different fur colors?

a temperature affects the expression of pigment - producing genes

b the rabbits develop different chromosomes

c only cold temperatures allow dna to function

d each rabbit has different gene combinations for fur color

Explanation:

First Question (Why do genetically identical organisms sometimes look different?):

• Option a: DNA doesn't change dramatically after childhood in a way that explains this; genetic identity would be lost if DNA changed. Eliminate.
• Option b: Nutrient consumption doesn't "hide" genes; genes are expressed based on regulation, not nutrient availability for "showing" genes. Eliminate.
• Option c: Environmental factors (like temperature, diet, etc.) can affect gene expression, so even with identical genes, different environments lead to different phenotypes. Correct.
• Option d: Mutations are not a constant "always occur" during development, and they would change genetic identity, which is stated as identical here. Eliminate.

• Option a: Temperature is an environmental factor that can regulate the expression of genes related to pigment production, leading to different fur colors. Correct.
• Option b: Rabbits of the same species have the same chromosome set; development doesn't create new chromosomes. Eliminate.
• Option c: DNA functions in a range of temperatures, not only cold. Eliminate.
• Option d: If raised (implying same genetic background, like same breed), they don't have different gene combinations for fur color. Eliminate.

Answer:

c. Environmental conditions affect how genes are expressed

Second Question (Why do rabbits raised at different temperatures have different fur colors?):