Researchers have suggested that our sensitivity to peer influence is genetically predisposed because it has facilitated the process of human mating. Jaquetta was exposed to excess testosterone during prenatal development. Japanese children have higher average intelligence scores than American children.
Fraternal twins are more similar in their intelligence scores than are ordinary siblings.
The intelligence scores of children are positively correlated with the intelligence scores of their parents. Identical twins reared separately are more similar in their intelligence scores than fraternal twins reared together. Professor Taylor suggested that a cautious attitude toward sexual encounters has proven to be more reproductively advantageous to women than to men because eggs are much less abundant than sperm. If a genetically based attraction to beautiful people contributes to survival, that trait will likely be passed on to subsequent generations. People have always responded so positively to Alyssa's good looks that she has developed a socially confident and outgoing personality.