A potential flaw of twin studies is that
A) monozygotic twins do not always have identical genes.
B) dizygotic twins do not have identical genes.
C) parents may treat identical twins more similarly than they treat fraternal twins.
D) parents may treat fraternal twins more similarly than they treat identical twins.

Question

Quizplus · Accepted Answer

The potential flaw of twin studies is that parents may treat identical twins more similarly than they treat fraternal twins. This can lead to a bias in the results of the study, since similarities between the twins may be due to shared environment rather than genetic factors.

A Potential Flaw of Twin Studies Is That