A Large Population of Laboratory Animals Has Been Allowed to Breed

question 16

Multiple Choice

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 estimated frequency of allele A in the gene pool?

• A) 0.25
• B) 0.50
• C) 0.75
• D) 0.125

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