Recall the mechanisms of genetic evolution discussed in the previous chapter. What is the relationship between gene flow and the existence of clines between human populations?
A. Gene flow increases the genetic isolation of neighboring groups, resulting in discrete genetic differences in the population, instead of clines.
B. There is no relationship between gene flow and clines.
C. Gene flow, the exchange of genetic material across populations, results in clines, which are gradual shifts in gene frequencies between neighboring groups.
D. Clines accelerate gene flow and genetic change due to chance.
E. Gene flow causes abrupt differences in gene frequencies between neighboring groups.
Answer: C
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