AP Biology Quiz
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NATURAL SELECTION
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Two populations of mammals are separated by a newly formed canyon that prevents most movement between sides. After 3,000 generations, individuals from the two sides can mate in captivity and produce healthy F1 offspring, but F1 offspring produce few viable gametes, resulting in very low fertility. Genetic analyses show substantial divergence in allele frequencies between the canyon populations. Which reproductive isolation mechanism is most directly demonstrated by the captive breeding results?
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