Anna and Hannah are monozygotic twins who have agreed to take part in a research study on the heritability of personality traits. Which of the following is an issue that might act as a confound in this research?
A) DZ twins may be treated more alike than identical twins.
B) MZ twins purposefully join different clubs and have different friends.
C) MZ twins may share more of their environment than DZ twins.
D) All of these are correct.

Question

Quizplus · Accepted Answer

The shared environment is a confounding variable in twin studies because it can contribute to the similarity between twins. Since monozygotic twins share all of their genes, any observed differences between them can be attributed to environmental factors. Therefore, it is important to control for the shared environment in twin studies. The other options, A and B, are not related to the shared environment and are not confounding variables in this context.

Anna and Hannah Are Monozygotic Twins Who Have Agreed to Take