Autopolyploidy is a multiple increase in the set of chromosomes in a certain type of living organism. This method is widely used in plant breeding and allows obtaining polyploid forms (4n, 6n, 8n, etc.).
Alloploidy is a multiple increase in the set of chromosomes in interspecific and intergeneric hybrids. The sterility of interspecific hybrids is due to the fact that their chromosome set is represented by different chromosomes, which in meiosis do not form pairs (do not conjugate). As a result of alloploidy, all chromosomes of interspecific hybrids become paired and can conjugate in meiosis, which ultimately leads to the formation of gametes.
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