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Increase in the proportion of ‘Anglo-Saxon’ Y-chromosomes through time under different combinations of selective advantage and intermarriage (U=D; see §2), starting with 10% immigrants immediately following migration. Selective advantage values of (a) 1.2, (b) 1.5 and (c) 1.8 were modelled. For each value of selective advantage, values of intermarriage of 0.02, 0.04, 0.06, 0.08 and 0.10 were used, as indicated above lines.
