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(s)the effects of teratogens.

Question

Quizplus · Accepted Answer

The fact that one twin may be more affected than the other even though their blood alcohol levels are equal suggests that the differences in the twins' alleles for the enzyme that metabolizes alcohol are influencing the effects of teratogens (in this case, alcohol). This suggests that the genes of the embryo/fetus are a key factor in determining how they will respond to teratogens.

A Woman Carrying Dizygotic Twins Drinks Alcohol