Meiosis in allopolyploids -- the importance of 'Teflon' chromosomes.

Polyploids possess two or more sets of related chromosomes as a result of either the doubling of chromosomes following sexual hybridization within the same species (autopolyploidy), or between closely related species containing related but not completely homologous (homoeologous) genomes (allopolyploidy). For allopolyploids to produce viable gametes and be fertile, they must behave as diploids during meiosis, so that only identical chromosomes (homologues) pair. A solution to this problem is an enhanced ability to resolve incorrect pairing, which in turn promotes correct pairing. This gives nonhomologous chromosomes an almost 'Teflon'-like status, so that only the correct pairs 'stick'.