show complete apathy and indifference to the first monkeys they encounter.”

are less likely to be strongly gender-typed.

any two biologically unrelated pairs are likely to share many striking

stress; least likely to benefit from

no sex difference in the brains of males and females.

has both biological and environmental influences.”

in both males and females; only in females

only in males; only in females

the impact of epigenetic marks on gene expression.

learn how the structure and function of genes interact with our environment to influence behavior.