could pose another problem: A human spermatozoon may not be equipped to navigate the reproductive tract of a chimpanzee, for example.,” or those factors that would make it impossible for a hybrid animal fetus to grow into a reproductive adult. If a human were indeed inclined and able to impregnate a monkey, post-zygotic mechanisms might result in a miscarriage or sterile offspring. The further apart two animals are in genetic terms, the less likely they are to produce viable offspring.
Neanderthals weren’t our ancestors’ only dalliance with other primates. “Pre-humans” and “pre-chimpanzees” interbred and gave birth to
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