Please Use the Following Information to Answer the Questions Below

question 71

Multiple Choice

Please use the following information to answer the questions below.
A large population of laboratory animals has been allowed to breed randomly for a number of generations.After several generations,25% of the animals display a recessive trait (aa) ,the same percentage as at the beginning of the breeding program.The rest of the animals show the dominant phenotype,with heterozygotes indistinguishable from the homozygous dominants.
-What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait (aa) has not changed over time?

• A)The population is undergoing genetic drift.
• B)The two phenotypes are about equally adaptive under laboratory conditions.
• C)The genotype AA is lethal.
• D)There has been a high rate of mutation of allele A to allele a.

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