Two Rapidly Evolving Genes Offer Geneticists Clues To Why Hybrids Are Sterile Or Do N

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While hybrids -- the result of the mating of two different species -- may offer interesting and beneficial traits, they are usually sterile or unable to survive. For example, a mule, the result of the mating of a horse and a donkey, is sterile. Now, Cornell researchers have made the first identification of a pair of genes in any species that are responsible for problems unique to hybrids.