That's very interesting. Thanks for contributing! I love mules! They are swift on their feet, strong, and many have great personalities! I rode one down and up the Grand Canyon once. They would walk so close to the edge and I'd be like, "oh lord, bless this animal with magic hooves!" They would go through obstacles like it was nothing and, meanwhile, I'm seeing the 6,000 foot or less canyon off to my side and I'm shitting bricks. I would never do that again. I'd sooner go down on foot. Those animals are ballsy.Mules are sterile also.
Anyways, here's more on the matter of mules being sterile...
Mules are sterile because they have an odd number of
. A horse has 64 chromosomes, and a donkey has 62.
When they mate, they produce mules with 63 chromosomes.
The chromosomes don't pair up correctly during meiosis I synapsis.
This makes it impossible for mules to produce viable sperm and
Mules inherit 32 chromosomes from the horse mother and 31 chromosomes from the donkey father. The chromosomes don't match up well. This is because of the differences in horse and donkey chromosome numbers and a lack of homology.
Sterility is the physiological inability to effect sexual reproduction in a living thing. It can be an inherited trait, or it can be acquired from the environment. For example, it can be acquired through:
- Physical injury
- Exposure to radiation