 For example, if it is assumed that few or no Germanic women settled in these areas, then the Germanic contribution to the gene pool is halved to 30%, and in turn if greater numbers of women did settle, the contribution could be even higher than 60%.Current estimates on the initial contribution of Anglo-Saxon migrants range from less than 10,000 to as many as 200,000, although some recent Y-chromosome studies posit a considerably large continental (Germanic) contribution to the current English gene pool (50–100%).A recent study by a team from the Department of Biology at University College London based on computer simulations indicate that an apartheid-like social structure in early Anglo-Saxon England provides a plausible explanation for a high-degree of continental male-line ancestry in England.