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:

Pressure Filtration

A process where solid particles are separated from liquids through the application of pressure, forcing the liquid through a semipermeable barrier.

Distal Convoluted Tubules

A portion of the kidney nephron that lies between the loop of Henle and the collecting ducts, involved in the reabsorption of water, sodium, and glucose.

Active Transport

The movement of molecules across a cell membrane from a lower to a higher concentration, requiring energy expenditure.

Protein

Large molecules composed of amino acids that perform a vast array of functions in the body, including catalyzing metabolic reactions, DNA replication, and responding to stimuli.