One issue with studies of heritability that compare monozygotic and dizygotic twins is that such comparisons
A) overestimate the influence of genes on behavior.
B) underestimate the influence of genes on behavior.
C) overestimate the influence of the environment on behavior.
D) cannot differentiate between prenatal and postnatal environments.

Question

Quizplus · Accepted Answer

Monozygotic twins share 100% of their genes, while dizygotic twins share about 50%. Studies comparing them often assume that the environment is equally similar for both types of twins, which can lead to an overestimation of genetic influence if the environment is actually more similar for monozygotic twins.

One Issue with Studies of Heritability That Compare Monozygotic and Dizygotic