"Eve" is the one that did leave descendants.
Pronoun antecedent problems here. My "she" was the one who left her mtDNA in no descendents.
A point of clarification might be good here:
While "Eve: maybe the only one whose mtDNA got through that does NOT mean that many other women don't have descendants alive today. In fact, I may be related to half (or more ) of ALL humans alive 100,000 years ago. Nao?
Not really. I'm not expert at this (pop gen was my second worst course in school, and I have attemptd faithfully to avoid it since), but my understanding is that initial population size doesn't matter - eventually every lineage will coalesce. Remember, we're tracing polymorphisms back in time from current populations. Additionally, it doesn't matter much what the size of the sample of modern populations is - the statistical variance based on sample size, which is usually 1/n, is only 1/logn with coalescent theory (don't ask me why). So either way you look at it, population size doesn't matter.
The "tracing back from current" leaves me with a bit of room for confusion.
Are you saying "initial" == current population size doesn't matter? That makes sense to me.
When I said "initial" I meant the population at sometime in the past. Specifically the time of mtDNA Eve or Y Adam. Does that also not matter? It seems to me that it must matter. At least if it was larger then I must have more time before the lineages coalesce. Obviously a population of 20 million during Roman times will not have coalesced under most circumstances by now. But a population of 1,000 may well be almost sure to have.
BTW: I'm about half way through "Adam's Curse" by Bryan Sykes. It is an excellent read (that is easy) and full of interesting tidbits.
Thanks for the site. I'll have a peek to avoid any more silly questions.