Combining the genes of two parents in offspring increases ________ in the population, which is valuable for a species because it provides more characteristics for natural selection to operate on.
A. genetic uniformity
B. the number of males
C. the number of females
D. genetic variability
Answer: D
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What is the most likely shape for a distribution with a mean of 40 and a mode of 45?
a. Symmetrical c. Negatively skewed b. Positively skewed d. Either positively or negatively skewed
How did many scientists during the 1930s and 1940s try to explain homosexual orientation?
a. By exploring physical differences between male and female gay and straight people b. By exploring men's and women's motivations to identify as gay or lesbian c. By exploring brain differences between gay and straight men and lesbian and straight women d. By exploring the family backgrounds of gay men and lesbian women
The one physical trait of males that seems to be innately attractive to women is:
a. large eyes b. white teeth c. height d. muscular back
About what percent of U.S. women today use some type of reproductive technology to become pregnant?
a. 0.1% b. 1% c. 4% d. 15%