hybrid breakdown

biology

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June 29, 2026

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Hybrid breakdown occurs when hybrids between closely related species are partially fertile, but their offspring are either not viable or are sterile. This is a type of postzygotic reproductive isolating mechanism, meaning it takes effect after fertilization. While hybrids themselves may appear vigorous, their progeny may die during development or grow into weak plants. This phenomenon is more common in plants than in animals. Hybridization, in general, is important for increasing genetic variety within a species, which is crucial for evolution.12

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evolution
Hybrid breakdown
In plants more than in animals, hybrids between closely related species are sometimes partially fertile. Gene exchange may nevertheless be inhibited because the offspring are poorly viable or sterile. Hybrids between the cotton species Gossypium barbadense, G. hirsutum, and G. tomentosum appear
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In plants more than in animals, hybrids between closely related species are sometimes partially fertile. Gene exchange may nevertheless be inhibited because the offspring are poorly viable or sterile. Hybrids between the cotton species Gossypium barbadense, G. hirsutum, and G. tomentosum appear
Read More