You Are Studying a Gene That Controls Ossicone (Horn) Length

question 36

Multiple Choice

You are studying a gene that controls ossicone (horn) length in giraffes. The wild-type long-ossicone allele (L) is dominant to the mutant short-ossicone (l) allele. However, the L allele is only 60% penetrant. You cross two heterozygous giraffes. What proportion of offspring would you expect to exhibit the short-ossicone phenotype? Assume the penetrance of L applies equally to both homozygotes and heterozygotes.

• A) 0.25
• B) 0.40
• C) 0.45
• D) 0.55
• E) 0.60

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Definitions:

Taste Preferences

The individual inclination or liking for specific flavors and types of food, which can be influenced by genetic, cultural, and environmental factors.

Basal Metabolic Rate

How quickly the body expends energy to sustain essential activities like respiration and blood circulation when at rest.

Settling Point

A theory suggesting that body weight is regulated at a predetermined, or preferred, level by a feedback control mechanism.

Set Point

A theory suggesting that the body regulates its weight and energy balance through internal controls, maintaining a stable weight over time.