Explain skin color in terms of polygenic inheritance
What will be an ideal response?
Polygenic inheritance refers to the fact that many genes influence a person's phenotype. Geneticists believe that children get several genes for skin color from each parent, so if one parent is dark-skinned and the other is light-skinned, the child will have a skin color that is somewhere between the two.
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Epidemiologists have a difficult time pinning down the prevalence of personality disorders because
a. there is considerable overlap among categories in these disorders. b. there are too many dimensions to be measured. c. there is no agreement on the criteria for personality disorders. d. they are so rare.
Some of the most dramatic physiological changes during sexual excitement are due to vasocongestion, which refers to
a. increased muscular tension. b. elevated respiration rates. c. engorgement of blood vessels. d. decreased neurotransmitter activity.