SAT Subject Biology Practice Question 202: Answer and Explanation

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Question: 202

12. Which refers to the degree to which a phenotype is determined by genetic variation in a population?

A. Fitness
B. Heritability
C. Limited environmental resources
D. Overproduction of offspring
E. Phenotypic variation

Correct Answer: B

Explanation:

The extent to which a phenotype is determined by differences in alleles in a population is referred to as heritability. Natural hair color is a highly heritable trait, whereas the number of legs has almost no heritability because there is little genetic variation for this phenotype in the population.

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