Transylvanian Dutch links to a New York Times blog post claiming that more of our ancestors are women than men.
While it’s true that about half of all the people who ever lived were men, the typical male was much more likely than the typical woman to die without reproducing. Citing recent DNA research, Dr. [Roy F.] Baumeister explained that today’s human population is descended from twice as many women as men. Maybe 80 percent of women reproduced, whereas only 40 percent of men did. [Link]An update to the post gives a good explanation of how this is possible. In short, the difference in reproduction rates combined with pedigree collapse makes it more likely that men will appear multiple times in your family tree with different mates than will women.