As disgusting as it may seem, I'm pretty sure that a human-chimpanzee hybrid is very much possible.
This belief is supported by the ability of Tigers & Lions (=Liger/Tigon), Horses and Donkeys (=Mule), etc., to (respectively) interbreed even though they all have differing numbers of chromosomes.
This belief is supported by the ability of Tigers & Lions (=Liger/Tigon), Horses and Donkeys (=Mule), etc., to (respectively) interbreed even though they all have differing numbers of chromosomes.