Use This Information to Answer the Following Questions

question 42

Multiple Choice

Use this information to answer the following questions.
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.
• E) There has been sexual selection favoring allele a.

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Definitions:

Conditional Expressions

Expressions in programming that evaluate to different values depending on a given condition, commonly used for decision-making.

If-else Statements

Control structures that execute a block of code if a specified condition is true, and optionally another block if the condition is false.

Goto Statement

A control flow statement in many programming languages that allows for an unconditional jump to another point in the same function.