Multiplication of chromosomes, allowing for fertile hybrid offspring, is known as

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Polyploidy is the multiplication of chromosome sets, resulting in an individual with more than two sets of chromosomes. This can lead to fertile hybrid offspring, as seen in many plant species. Pleitropy refers to a single gene affecting multiple traits, while apomixis is a form of asexual reproduction in plants. Allopatry refers to populations being geographically separated, which can lead to the formation of new species over time.

Multiplication of Chromosomes, Allowing for Fertile Hybrid Offspring, Is Known