Mary Jo and Bobbi Jo are identical twins. Their parents dress them alike, put them in the same classes and treat them identically. If Betty Jo and Mary Jo were selected to participate in a twin study, they may contaminate the results by leading to a violation of the assumption.

Question

Quizplus · Accepted Answer

The assumption of equal environments in twin studies posits that the environments experienced by both twins are equally similar or different, regardless of whether they are identical or fraternal. When twins like Mary Jo and Bobbi Jo are treated identically by their parents, it could lead to an overestimation of genetic effects if the assumption of equal environments is violated, as it assumes any similarities are due to genetics rather than the highly similar environments.

Mary Jo and Bobbi Jo Are Identical Twins