Several Behavioural Genetic Studies of Self-Concept Have Been Conducted Using

Several behavioural genetic studies of self-concept have been conducted using adolescent twin pairs.Based on the results of these studies, what percentage of the variability in children's self-concepts does genotype account for?

A) about 50 percent of the variability in their masculine self-concepts
B) about 50 percent of the variability in their feminine self-concepts
C) between 15 and 35 percent of the variability in their feminine self-concepts
D) between 0 to 20 percent of the variability in their masculine self-concepts