A large study of MZ and DZ twin pairs across multiple countries found that the correlations in IQ between co-twins _____ with age for DZ twins and _____ with age for MZ twins.

Question

Quizplus · Accepted Answer

The correlations in IQ between co-twins decreased with age for DZ twins, meaning that the genetic influence on IQ became less important as they aged. On the other hand, the correlations increased with age for MZ twins, indicating that the genetic influence on IQ became more important with age.

A Large Study of MZ and DZ Twin Pairs Across