A woman carrying dizygotic twins drinks alcohol. The twins' blood alcohol levels are equal, yet one twin may be more severely affected than the other because their alleles for the enzyme that metabolizes alcohol differ. This is evidence that the _____ influence the effects of teratogens.

Question

Quizplus · Accepted Answer

The fact that one twin may be more affected by alcohol than the other due to differences in their alleles for the enzyme that metabolizes alcohol indicates that genes of the embryo/fetus can influence the effects of teratogens. This is known as genetic susceptibility. The other choices (kinds of substances, genes of the parent, and doses of teratogen) do not specifically address this issue of genetic susceptibility.

A Woman Carrying Dizygotic Twins Drinks Alcohol