reproductive isolation
Quick Summary
Reproductive isolation refers to the inability of a species to successfully breed with related species due to various barriers. These barriers prevent interbreeding and are known as reproductive isolating mechanisms (RIMs).12
There are two main categories of RIMs:
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Prezygotic RIMs: These occur before fertilization and include:
- Ecological isolation: Species living in different habitats.
- Temporal isolation: Species mating or flowering at different times.3
- Ethological (behavioral) isolation: Differences in courtship rituals or mating behaviors.4
- Mechanical isolation: Physical incompatibility of reproductive organs.
- Gametic isolation: Sperm and egg cells being unable to attract or fertilize each other.2
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Postzygotic RIMs: These occur after fertilization and reduce the viability or fertility of hybrid offspring, such as hybrid sterility.5
Geographic separation alone is not considered a RIM, as it does not involve biological incompatibility.2
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