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.

---

Definitions:

Recall

The act of retrieving information or events from the past in one's memory.

Nonsense Syllables

Random strings of letters without inherent meaning, often used in memory and learning experiments to study the processes of human cognition.

Ebbinghaus

Refers to Hermann Ebbinghaus, a psychologist known for his research on memory, specifically the forgetting curve and the spacing effect.

Multiple-Choice

A type of question or survey format that presents respondents with several answers and requires them to select the correct one.