Tomenable
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Alan,
The model of male elite dominance affecting Y-DNA - similar to the one David is talking about - has been mathematically validated.
Heinrich Härke, Mark Thomas and Michael Stumpf created a realistic model showing that certain Y-DNA types can increase in frequency from 10% to 50% of the total during just 8 up to 12 generations (1 generation = ~25 years). All that is needed is female mate choice (or any other factor) giving dominant male group a selective advantage of 1.2 to 1 per generation. If group "B" conquers group "A" and initially B has 10% of Y-DNA and A has 90%, then if during the next 8-12 generations for every 1 A woman taking an A male as husband, 1.2 A women take a B male as a husband, then frequency of B haplogroups should increase to 50% of all Y-DNA after such time. If selective advantage is lesser than 1.2, then it will take more generations.
The paper in question, which discusses this model, is "Evidence for an apartheid-like social structure in early Anglo-Saxon England". I am not saying that the model is based on valid data (because it is based on Capelli's 2002 estimates saying that half of English Y-DNA is Germanic - in reality the % of Germanic Y-DNA in English people can be lower; ancient DNA will tell us), but the model itself works with realistic mechanisms. The model shows 10% influx invading males ruling over 9 times more numerous local males, could still increase their Y-DNA from 1/10 to 1/2 even during just a dozen or so generations. And that of course without slaughtering the locals, just skewing the access to young females in favour of the victors.
All you need is an apartheid-like society, in which dominant groups can have as many wives as they want, etc.
The model of male elite dominance affecting Y-DNA - similar to the one David is talking about - has been mathematically validated.
Heinrich Härke, Mark Thomas and Michael Stumpf created a realistic model showing that certain Y-DNA types can increase in frequency from 10% to 50% of the total during just 8 up to 12 generations (1 generation = ~25 years). All that is needed is female mate choice (or any other factor) giving dominant male group a selective advantage of 1.2 to 1 per generation. If group "B" conquers group "A" and initially B has 10% of Y-DNA and A has 90%, then if during the next 8-12 generations for every 1 A woman taking an A male as husband, 1.2 A women take a B male as a husband, then frequency of B haplogroups should increase to 50% of all Y-DNA after such time. If selective advantage is lesser than 1.2, then it will take more generations.
The paper in question, which discusses this model, is "Evidence for an apartheid-like social structure in early Anglo-Saxon England". I am not saying that the model is based on valid data (because it is based on Capelli's 2002 estimates saying that half of English Y-DNA is Germanic - in reality the % of Germanic Y-DNA in English people can be lower; ancient DNA will tell us), but the model itself works with realistic mechanisms. The model shows 10% influx invading males ruling over 9 times more numerous local males, could still increase their Y-DNA from 1/10 to 1/2 even during just a dozen or so generations. And that of course without slaughtering the locals, just skewing the access to young females in favour of the victors.
All you need is an apartheid-like society, in which dominant groups can have as many wives as they want, etc.