Based on my understanding of genetics this reasoning is very unattractive. 500 generations is the blink of an eye in genetic terms, certainly not enough to establish a pervasive biological truth that splits the whole species across gender lines; maybe you could drive a single variant to global fixation in that time, certainly not a whole host of them. We also know nothing about how strong the selection in question might be. We know nothing, in fact, to suggest that evolution is &quot;likely&quot; other than our own gut feeling that it must be.<p>As for testing, that would be great. But it turns out that proving anything about human evolution is very hard, because most of the evidence is lost.