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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Definitions:

Respiratory Problems

Health issues affecting the organs and tissues that make gas exchange possible, like the lungs and airways.

Adults

Individuals who have reached the age where they are considered fully developed and responsible for their actions from a legal or societal standpoint.

Lanugo

Fine, soft hair, especially that which covers the body and limbs of a human fetus or newborn.

Dark Hair

A physical characteristic referring to the presence of higher levels of melanin in the hair, resulting in shades ranging from brown to black.