When the lens of the eye focuses light on the retina, the result is a(n):

A behavior geneticist described research on the genetic influences on personality. He noted, "You have to remember that these influences involve quite a number of genes even for the simplest personality trait."

Which concept was the behavior geneticist discussing? a) meiosis b) dominant genes c) polygenic inheritance d) chromosomal abnormalities

Why are males more likely than females to exhibit sex-linked traits?

a) Males have higher stress levels. b) Females are actually the stronger sex. c) Females have a protective enzyme in their sex hormones. d) Males' Y chromosome may not have a necessary dominant gene.