There's an idea I've seen a number of times that 80% of women have had descendants, but only 40% of men. A little research tracked it back to this, but the speech doesn't have a cite and I haven't found a source.
The reproduction rates for men and women (possibly for the whole history of the species) seems like the sort of thing which could be found out, but I'd like more solid information.
Well I think what we have established is that it is all in DNA as most things are but what I ask is if there are more girls coming in families resulting in more ancestors then WHY are there more boys in the world
This is not related to OP's question, but are there more males in the world? Keep in mind that males have lower life expectancies at all ages (due in part to taking more risks and that sort of thing).