If mate selection were random:
a. African Americans would be more likely to marry whites than other African Americans.
b. upper-class people would be even less likely to marry lower-class people.
c. inter-religious marriages would not exist.
d. divorce rates would be much higher.
e. marriage would be more inter-religious.
Question 2
The United States population pyramid qualifies as because, except for the oldest categories, each cohort is roughly the same size.
a. expansive
b. constrictive
c. stationary
d. triangular
Alarm calling, a possible example of kin selection.
The clonal selection hypothesis
Tusks of African and Asian elephants.
African bush (savanna) elephant in Etosha National Park, Namibia.
The effect of disruptive selection on bristle number in Drosophila
Directional selection