rising@utzoo.uucp (Jim Rising) (10/13/88)
I suspect that there has been selection in both human sexes for secondary sexual characteristics--i.e. neither represented an "undifferentiated" human. If there were to be only one sex, however, it would have to be female (repro. parthenogenetically). This occurs in some fish (teleosts), amphibians (salamanders), and lizards (two differnt families), but not in birds (except rarely in turkeys in captivity?) or mammals. My point is that if one sex came before the other, it would have to be females, but it is unlikely that parthenogenesis is in our ancestry, or if so, certainly not recently. --Jim Rising -- Name: Jim Rising Mail: Dept. Zoology, Univ. Toronto Toronto, Ontario, Canada M5S 1A1 UUCP: {allegra,ihnp4,linus,decvax}!utzoo!rising