Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then species W and Y
A) are still sibling species.
B) shared a common ancestor more recently with each other than either did with the other two species.
C) may merge into a single species if their hybrids remain fertile over the course of many generations.
D) A and B only
E) A, B, and C
Answer:
E) A, B, and C
A) are still sibling species.
B) shared a common ancestor more recently with each other than either did with the other two species.
C) may merge into a single species if their hybrids remain fertile over the course of many generations.
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