Y-Chromosome Ancestry

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The Y-chromosome, unlike most DNA, is inherited only from the father, which means that all DNA on the human Y chromosome comes from a single person. This does not mean that there was only one person alive at that time, but that a single man's Y-chromosomal DNA has out-competed the other strains and is now - not taking into account smaller and less drastic mutations - the only one left. Because the only factor affecting the makeup of the DNA on the chromosome is mutation, measuring mutation rates and extrapolating them backwards can tell you when this man lived. Calculations by the geneticist Spencer Wells have shown that this man lived around 60,000 years ago1.(2)

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