reply to post by SL55T0T0
Life forms have all sorts of different chromosomes, including the number of chromosomes they actually have. Humans for example have 46 (23 pairs),
just like the hare, but butterflies have 380.
Most species have a vastly different number of chromosomes and most have not been mapped at all or partially mapped. There are a lot of species in
the world and it is not easy to map the gene structure of any given animal.
But i found this: Cat with "Downs syndrome" www.itchmo.com...
Other than that,
I dont know what would happen or how often it happens in animals.

