Biology / Bio 1703 · Atom · ~20 seconds
Alloploidy
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Alloploidy, or allopolyploidy, occurs when gametes from two species combine and the hybrid's chromosome number then doubles into a fertile, stable lineage.
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Cultivated wheat is an alloploid, combining chromosome sets from more than one wild ancestral species across two reproductive events.
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Alloploidy needs two reproductive steps to reach a stable, fertile lineage — a first-generation hybrid alone is typically sterile.