Which of the following describes a prezygotic barrier that could contribute to reproductive isolation?
a. A male moth lacks the specific sensory receptors for a pheromone produced by a female moth.
b. Two grass varieties possess different mutant recessive alleles and offspring resulting from backcrossing with hybrids express more detrimental recessive traits.
c. The offspring of crosses between lions and tigers cannot produce offspring themselves.
d. Different salamander subspecies of a single genus produce offspring with each other, but these have shorter life spans than offspring of two parents within the same subspecies.
e. None of the listed responses describe a postzygotic barrier.
Answer: a. A male moth lacks the specific sensory receptors for a pheromone produced by a female moth.
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