You would like to know if two populations of fish are reproductively isolated and thus different species, according to the biological species concept. Which of the following would provide evidence for a prezygotic barrier to reproduction?
A. The populations form viable offspring, but the offspring are less fit.
B. a hybrid fetus never reaches term
C. Cell surface proteins of one species eggs prevent sperm from another species attaching, so the sperm cannot fertilize it.
D. One is usually found on the south side of the lake while the other is found on the north side
Answer: C. Cell surface proteins of one species eggs prevent sperm from another species attaching, so the sperm cannot fertilize it.
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