A Woman Carrying Dizygotic Twins Drinks Alcohol

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.

A) kinds of substance
B) genes of the parent
C) genes of each twin
D) doses of teratogen

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