What are the descendants of donkeys?

horses, donkeys and mules all have sexual reproduction, and whether mules can bear children is directly related to the number of chromosomes in their cells. Because mules are born by crossing horses and donkeys, the number of chromosomes in their cells is determined by the number of chromosomes in horses and donkeys. For Malays, the number of chromosomes in their somatic cells is 64, that is, 32 pairs, and the germ cells are formed by meiosis, of which the number of chromosomes is half that of somatic cells. For donkeys, the number of chromosomes in their somatic cells is 62, that is, 31 pairs, and the number of chromosomes in their germ cells is 31. When horses and donkeys are mated, their hermaphroditic germ cells, that is, sperm and egg cells, combine to form fertilized eggs. The number of chromosomes in fertilized eggs is the sum of the chromosome numbers of their germ cells, that is, 63. From such fertilized eggs, they will grow into mules in the future, so the number of chromosomes in mule somatic cells is also 63. It is odd. Of these 63 chromosomes, 32 are from horses and 31 are from donkeys. When a mule produces germ cells, it must undergo meiosis first, which means homologous chromosome pairing. Because 32 chromosomes from horses and 31 chromosomes from donkeys in the mule are disordered during association, meiosis can't proceed normally, so it can't produce normal germ cells, so the mule can't have offspring.