Which of the following is strong evidence for a genetic contribution to a behavior?
A) Dizygotic twins have a higher concordance rate than do monozygotic twins.
B) Monozygotic twins have a higher concordance rate than do dizygotic twins.
C) Dizygotic twins have a lower concordance rate than do monozygotic twins.
D) Adopted children resemble their adopted families with regard to a trait.
E) Family members are less similar for a trait than are members of the general population.

Question

Quizplus · Accepted Answer

Monozygotic twins share 100% of their genes, while dizygotic twins share only 50% on average. Therefore, if monozygotic twins have a higher concordance rate (i.e. both twins exhibit a particular behavior or trait) than do dizygotic twins, it suggests that there is a strong genetic contribution to that behavior or trait. The opposite scenario (where dizygotic twins have a higher concordance rate) would suggest a weaker genetic contribution.

Which of the Following Is Strong Evidence for a Genetic