Which of the following hypothetical research findings would present a problem for researchers trying to interpret results from a twin-study design?
A) Parents of monozygotic twins treat the two twins more alike than do parents of dizygotic twins.
B) Dizygotic twins don't look as much like one another as do monozygotic twins.
C) Parents treat female pairs of twins differently than they treat male twins.
D) There are more dizygotic twins born each year than monozygotic twins.

Question

Quizplus · Accepted Answer

One of the assumptions of the twin-study design is that the environments experienced by monozygotic and dizygotic twins are comparable. If parents of monozygotic twins treat them more similarly than parents of dizygotic twins, this would violate the assumption of equivalent environments and could impact the interpretation of results.

Which of the Following Hypothetical Research Findings Would Present a Problem