A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Post-zygotic isolating mechanisms have arisen.
B. Pre-zygotic isolating mechanisms have arisen.
C. Gene flow between the two populations does not occur.
D. Both pre- and post-zygotic isolating mechanisms have arisen.
E. Reproductive isolation is incomplete.
Answer: E
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