Reading 3-2

Human genetic evolution domestication has been by far

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Unformatted text preview: nesian-speaking farmers out of Taiwan over Island Southeast Asia30, Fertile Crescent farmers over Europe31,32, and Korean farmers over Japan33. Human genetic evolution Domestication has been by far the most important cause of changes in human gene frequencies in the past 10,000 years. Among the mechanisms responsible are: the spread of human genes from the agricultural homelands; the evolution of genetic resistance factors (including the ABO blood groups) to our new crowd infectious diseases34,35; the evolution of adult-persistent lactase in milk-consuming populations of northern Europe and several parts of Africa; the evolution of allozymes of alcohol metabolism permitting consumption of large quantities of nutritionally important beer in western Eurasia; and the evolution of adaptations to a diet higher in simple carbohydrates, saturated fats and (in modern times) calories and salt, and lower in fibre, complex carbohydrates, calcium and unsaturated fats, than the hunter–gatherer diet36. Unsolved questions Among th...
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