Why Is A Mule Infertile?

Why Is A Mule Infertile? Mules and hinnies have 63 chromosomes, a mixture of the horse’s 64 and the donkey’s 62. The different structure and number usually prevents the chromosomes from pairing up properly and creating successful embryos, rendering most mules infertile. Can mules ever reproduce? He explained that mules have an odd number of