Our regular commenter pngarrison let me know he has just posted a piece on his own blog, explaining the actual genetic situation regarding those often confused concepts of Y-chromosome “Adam”, mitochondrial “Eve”, population bottlenecks and so on. His training is in biochemistry, but with good of experience in genetics too.
I think it’s the clearest explanation I’ve read that actually gives some of the meaty scientific details, so I’d recommend it even to those non-biologists amongst us who find the concepts opaque. You should end up with a better grasp by the end.
The article also ends with some useful reflections on the theological significance, or non-significance, of these findings to the biblical account of Adam and Eve, in a way that (unlike some treatments) doesn’t simply shrug off the existence of Adam and say “Genetics can’t lie.” YECs may not be persuaded, but it gives the rest of us plenty to consider.
You should find the piece here.