Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!nrl-cmf!mailrus!tut.cis.ohio-state.edu!rutgers!rochester!pt.cs.cmu.edu!andrew.cmu.edu!jk3k+ From: jk3k+@andrew.cmu.edu (Joe Keane) Newsgroups: sci.bio Subject: Re: differences in male/female fetal development Message-ID: Date: 14 Dec 88 18:51:44 GMT References: <1262@paris.ics.uci.edu> Organization: Carnegie Mellon Lines: 6 In-Reply-To: <1262@paris.ics.uci.edu> If you plot the male/female ratio versus age, you get a consistent trend. More males are born, but more die in infancy and childhood. There's a crossover age (i forget what) at which there are equal numbers of each. At (say) 90 years old, there are many more females. So you'd expect an even higher ratio for embryos than infants born. There you are, proof by extrapolation. --Joe