Phenomenon, Lactase production increased in the northern European population over several generations., Evidence, The data show that the percentage of adults producing lactase increased from 12% in generation 0 to 82% by generation 6., Explanation, This occurs because individuals who could digest lactose were able to obtain nutrients and energy from milk, giving them a survival and reproductive advantage in populations that relied on dairy., Result, Individuals with the genetic trait for lactase production were more likely to survive and reproduce, causing the frequency of lactase production to increase in the population over time..

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