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Number of generations required to reach 50% ‘Anglo-Saxon’ Y-chromosomes (Weale et al. 2002; Capelli et al. 2003), under different combinations of selective advantage and intermarriage rate (U=D; see §2), assuming the population was made up of (a) 5%, (b) 10% and (c) 20% immigrants immediately following migration. Shaded area of graph indicates parameter combinations that lead to greater than 50% ‘Anglo-Saxon’ Y-chromosomes in less than 100 generations.
