If the heritability of a particular trait is found to be 60 percent, then by definition the other 40 percent is due to
A) random chance that impacts every organism.
B) prenatal environmental influences, such as toxins or viruses.
C) the effects of gene mutation.
D) differences in the individual's environment.
Answer: D
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Mary and Jane are arguing about the relative carcinogenic content of marijuana smoke and tobacco smoke. Mary says that marijuana smoke is more dangerous to one's health than tobacco smoke. Based upon the research, Mary is:
A. wrong, since the difference between the two is insignificant B. erong, because marijuana smoke has half the carcinogenic content of tobacco smoke C. right, because THC increases the body's susceptibility to carcinogens D. right, because marijuana smoke has about 50 percent greater carcinogenic content than tobacco smoke
Harry Harlow studied _____ in order to learn more about the importance of caregivers in social development.
A) infants in orphanages B) members of the Piraha tribe C) adopted children D) socially isolated rhesus monkeys
The age-old debate over whether we are mostly a product of our genes or of environmental influences is the __________.
A. nature–nurture debate B. empirical–rational debate C. creation–selection debate D. mind–body debate
At the beginning of emerging adulthood, age 18, about __________ of Americans have had intercourse at least once, and by age 25 nearly __________ emerging adults have had intercourse at least once.
A. one-quarter; one-half B. one-half; all C. three-quarters; all D. 90%; all