Posted: Apr 10, 2018 2:01 pm
The_Piper wrote:My cause for doubt is that if people can reproduce, those genes will make it into the next generation. But we don't even need to think about grandparents (or aunts and uncles, and other relatives who contribute to reproductive success), if the parents don't survive long enough to see their offspring reach sexual maturity because they got skin cancer and died.
True, dying before reproducing would make it a stronger factor than if it's just the grandparents thing. The only point I was trying to make is that it could still be the major driving force even if it only affects the grandparents, even though it might be a weaker force and the evolution towards darker skin might take a bit longer as a result.