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Africans' ability to digest milk linked to spread of cattle raising
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[QUOTE]Originally posted by Amun-Ra The Ultimate: [QB] This intro quoted below echo a bit what I said above about very strong positive selection events which affected populations with a very high level of LP (Lactase Persistence) in adulthood like Northwest Europeans, Northwest Niger-Congo speakers, etc. So populations who have lactase persistence at a lower but substantial level may have a herding past but didn't went through such a strong positive selection events (drought, diseases, famine, lack of vitamins, etc). They went through a lower degree of positive selection for LP. [QUOTE]Continued ability to digest lactose after weaning provides a possible selective advantage to individuals who have access to milk as a food source. The lactase persistence (LP) phenotype exists at varying frequencies in different populations and SNPs that modulate the regulation of the LCT gene have been identified in many of these populations. [b]Very strong positive selection[/b] for LP has been illustrated for a single SNP (rs4988235) in northwestern European populations, which has become a textbook example of the effect of recent selective sweeps on genetic variation and linkage disequilibrium. [/QUOTE]- Intro from [i]Stronger signal of recent selection for lactase persistence in Maasai than in Europeans[/i] [/QB][/QUOTE]
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