Height and Eye Colors Are Two Examples of Continuous Variation

Multiple Choice

Height and eye colors are two examples of continuous variation in humans.Whereas in pea plants the tall allele is dominant over the short allele,there are no intermediate heights in peas.Which of the following is the best explanation for the differences described above?

A) Humans are more advanced than pea plants;thus,the genetics of peas is much simpler than humans.
B) The intermediate size pea plant seeds are aborted within the seedpod and thus will never develop.
C) The intermediate size pea plant seeds have deleterious alleles that prevent them from germinating.
D) Many genes,rather than one gene for a characteristic,control some variations in species.
E) These variations in humans are affected by lack of dominance in the alleles that control these traits.