probability ain't your friend wrote:
stayed forever wrote:And then that kid has children with other people that have a pretty good chance of having those genes... and it spreads like wildfire through the population.
No, if you have 50% of the ABC genes and your spouse has 50%, your kids... will still have 50%. If you have mostly Kalenjin ancestry, you're missing most of the ABC genes. And if there are recessive traits in the ABC gene pool, they may never stick in the Kalenjin population.
That's why evolution takes a very long time. Good genes don't spread like wildfire, they are removed almost as easily as they are added.
Incorrect; close but scientifically incorrect. Do a Punnett square. One will have 100% of the ABC altitude adaptation, one will have 0%, and two will have 50%, if you have 4 kids. You have a 75% chance of getting some kind of altitude adaptation, though, but getting a full altitude adaptation is a 25% shot. Unfortunately, there is no way to know who has the gene and who doesn't, which validates your point of, "they are removed almost as easily as they are added". People who run don't know they don't have it, and those that don't run don't know they in fact do have it. It's all a game of chance if the advantage is actually a genetic adaptation, since it's a guessing game on choosing a mate that has the altitude adaptation in the first place.