The creation of the mule is arguably one of humanity's greatest agricultural achievements. The ancient Romans bred mules for their army, and George Washington was famously obsessed with breeding high-quality mules at Mount Vernon to improve American agriculture.
Because of the 63rd chromosome, the reproductive organs (gonads) develop, but the process of meiosis (cell division to create sperm or eggs) fails. The chromosomes cannot pair up correctly to divide. However, it is a myth that they have no sex drive. Male mules are gelded (neutered) to prevent aggressive behavior, while female mules (molly mules) can have working ovaries but almost never conceive. Horse Mating Donkey
Mating between is a biological cross-breeding process that results in two distinct types of hybrid offspring: the and the The creation of the mule is arguably one