The breeder's equation shows that the rate of evolution depends on the strength of heritability, and the strength of directional selection. Evolution can be expected when:
A. S is negative, and h^2 is 1
B. S is > 0 and h^2 < 0
C. S is equal to 0, and h^2 is > 0
D. S is not equal to 0, and h^2 is 0
Answer: A. S is negative, and h^2 is 1
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