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In page Banana:

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Mutation breeding can be used in this crop. Aneuploidy is a source of significant variation in allotriploid varieties. For one example, it can be a source of TR4 resistance. Lab protocols have been devised to screen for such aberrations and for possible resulting disease resistances.[1] Wild Musa spp. provide useful resistance genetics, and are vital to breeding for TR4 resistance, as shown in introgressed resistance from wild relatives.[2] Bananas form a hybrid-polyploid complex; hybrids can be diploid, triploid, tetraploid, or pentaploid, i.e. they may have 2, 3, 4, or 5 sets of chromosomes. This makes them difficult to breed as hybrids are often sterile, in addition to the challenge of breeding seedless (parthenocarpic) varieties.[citation needed]