看来生男生女还是妈妈决定的 :)# Biology - 生物学
b*y
1 楼
11/7/2002 -- When it comes to mating and determining whose sperm reaches the elusive egg, females control both the playing field and the rules of the game, according to a new study on male sperm competition vs. female choice to be published in the Nov.
8 issue of Science.
8 issue of Science.