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The answer is 63.

A stallion (male horse) has 64 chromosomes and a jenny (female donkey) has 62. The sterile progeny of these two has only 63 chromosomes (same as a mule, which is the offspring of a mare [female horse] and a jack [male donkey]). The 63 chromosomes cannot divide evenly so neither the hinny nor the mule can reproduce.

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16y ago

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