Matings between individuals from the two populations of Rhagoletis produce hybrid flies that appear to be healthy and have normal life spans. The eggs laid by these hybrid flies, however, hatch less often than those of flies from either of the two populations. What isolating mechanism seems to be important in this hybrid population?
A) Prezygotic isolation
B) Mechanical isolation
C) Reduced hybrid fertility
D) Habitat isolation
Answer: C) Reduced hybrid fertility
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