Reproductive isolation is more likely to occur when

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Reproductive isolation is more likely to occur when hybrids are less fit than members of the parent species because this reduces gene flow and helps maintain the genetic integrity of the parent species. If hybrids are more fit than members of the parent species, they may outcompete and eventually replace the parent species, leading to hybridization and loss of genetic diversity. If there are no differences in fitness between parent species and hybrids, there may be occasional hybridization events that do not lead to reproductive isolation.

Reproductive Isolation Is More Likely to Occur When