why are mules infertile? If a horse and a donkey have close enough genetics to have offspring, why is that offspring left with genetics that render them unable to have their own offspring?

Question

why are mules infertile? If a horse and a donkey have close enough genetics to have offspring, why is that offspring left with genetics that render them unable to have their own offspring?

In: 8368

Answer 1

So is the NUMBER of chromosomes of a species the actual determining factor of breeding?!?

Like if we could eliminate all… physical barriers of breeding. What is the process that prevents the hybridization of two different species?