For clarity, 500 generations is easily enough for some things to shift frequency, but I agree it would be fast for a mutation to go global. However, thrown weapons are on the order of ~20,000+ generations which is plenty of time for mutation and adaptation.
As to testing, I suspect we are going to get good at decoding and editing human DNA fairly soon which is going to have a lot to say about these debates. This stuff is either there or not, when and how it showed up (or not) is a separate issue.
EX: Domestic cattle are also around 500 generations old and lactose tolerance has been spreading. http://www.foodbeast.com/news/map-of-milk-consumption-lactos... lactose tolerance: 96% in Sweden, 10% in China.
Re:The Brain Is Hardwired to Snap
by astazangasta on Wednesday February 10, 2016 @07:53PM
(#11077487)
>when and how it showed up (or not) is a separate issue.
I don't think new data will help. We know the changes in the human lineage; even if we knew their functional meaning, we cannot conclude whether they are adaptive or not; fixed alleles reveal little about their fixation time, etc.
They believe the haast eagle evolved from the little eagle diverging just 700 000 years ago. That's going from one of the smallest eagles(0.8kgs) to the largest (11.5-14kgs) in under a million years.
As for testing, that would be great. But it turns out that proving anything about human evolution is very hard, because most of the evidence is lost.