>Humans and Apes had a common ancestor
>but they have a different set of Chromosomes
>that is an important reason why interbreeding between Humans and Apes is biologically impossible
>other rival humanoid species like Aboriginal Australians on the other hand have the same set of Chromosomes as Humans, which means we can actually breed with them

So what happened, when the first Humanoids developed a different set of Chromosomes. How did that work? Was there a single progenitor? How was he able to impregnate the other females?