[Zhangliqun]

Where do you expect such half-man, half-ape beings to have evolved from?

From apes, of course. If we came from them, then this half-breed would too, and would be the "missing link" between us and apes.

Otherwise, it has to be the case that at least two female apes in proximity to one another gave birth to fully human offspring, one of each sex, and the two fully human offspring grew up and mated. I'm no expert on genetic probabilities, but I think that one would have to be rather improbable.

[mysterio]

Of course the transition didn't occur all at once. It probably happened a lot the way hair loss is happening now. There's no reproductive disadvantage to having less body hair, so it has been gradually disappearing over thousands of years. Head hair, too. Harmful mutations kill us or make us unable to compete. Neutral ones occur and don't have any effect. Helpful ones are selected for, and develop over many generations.