SAT Subject Biology Practice Question 202: Answer and Explanation
12. Which refers to the degree to which a phenotype is determined by genetic variation in a population?
C. Limited environmental resources
D. Overproduction of offspring
E. Phenotypic variation
Correct Answer: B
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.