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Description:Researchers looked at church records of about of 5, people who lived in four different farming or fishing villages in Finland born between and , a time period where agriculture was relatively well established and society had strict rules against divorce and extramarital affairs. Researchers studied economic status, births, deaths and marriages to examine four key aspects of life that affect survival and reproduction, like which individuals lived beyond age 15, who got married or stayed single, how many marriages each individual had at the time a second marriage was only possible if a spouse died , and how many children were born in each marriage. The findings show that in all four villages natural selection was apparent and similar to selection seen in the wild, as almost half of the people who had died before age 15 had traits that were not favored by natural selection, like susceptibility to disease, and therefore none of their genes were passed on to the next generation.

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Views: 8227 Date: 2018-07-25 Favorited: 25 favorites

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