The more polyploid a species, the greater its capacity for gradual evolution. For haploid species like ants, which have a single chromosome set, mutations routinely result in certain death. Diploid species, like humans, can tolerate more genetic experimentation. A single mutation in both copies of HBB causes sickle cell anemia, but the same mutation in a single copy of the gene can confer greater resistance to malaria. Triploid plants, with multiple backups of every gene, take this even further. Harmful mutations are masked by healthy copies, reducing risk while allowing much richer genetic diversity than would otherwise be possible.
Валентин Карант (редактор отдела БСССР)
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