Use the Following Information to Answer the Questions Below

question 44

Multiple Choice

Use the following information to answer the questions below.
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 proportion of the population is probably heterozygous (Aa) for this trait?

• A)0.05
• B)0.25
• C)0.50
• D)0.75
• E)1.00

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Definitions:

Stomach

An organ in the digestive system that breaks down food using acids and enzymes, preparing it for further digestion in the intestines.

Jejunum

The middle section of the small intestine in humans and most higher vertebrates, responsible for the absorption of nutrients.

Dentin

The hard, dense, bony tissue forming the bulk of a tooth beneath the enamel.

Nerves

Bundles of fibers that transmit sensory and motor information throughout the body.