Which of the following provides some evidence that there is, in fact, a genetic component to handedness?
a. Between monozygotic twins, the likelihood that both children have the same dominant hand is no greater than between fraternal twins or non-twin siblings.
b. As teachers have stopped encouraging children to use their right hands, the percentage of left-handed children has risen.
c. Societies have favored right-handed people in their design of common objects, such as scissors, can-openers, and school desks.
d. The part of the brain that controls handedness, the substantia nigra, develops more fully in right-handed children than in left-handed children.
Question 2
Which of the following is NOT true regarding sex of child and physical activity?
a. Boys are more likely than girls to receive encouragement and support for participation in sports.
b. Parents emphasize physical activity of boys more so than girls in the preschool years.
c. By middle childhood, girls are more involved in competitive games than boys.
d. Boys tend to engage in more vigorous activity, on average, than girls.
Experimental evidence of the effect of allelochemicals on plant production.
Some organisms used as models in genetic research
genetic code: The basic principle of translation
Model depicting how genetic recombination
Genetic polymorphism for foraging behavior in fruit fly larvae
Cladogram showing genetic distances and relationships between human populations