A trait, such as height, has high heritability because much of the variation between individuals is the result of genetic variation. However, not all of the variation for height in a population can be attributed to genetic variation alone. Why does genetic variation not always determine the differences in a given trait between individuals? A. Independent assortment leads to new combinations of genes.
B. Changes in the environment can influence the expression of a gene.
C. Genetic drift changes the frequency of genes within a population
D. Random mutations lead to the generation of new alleles.