There is a point in human evolutionary history when the family trees of any two humans on earth could theoretically be traced back to the same two individuals.
And while these reports are factual, their framing plays into misconceptions about genealogical lineages. That misconception, as Scott Hershberger wrote in Scientific American, is that"humans are all more closely related than we commonly think." In an October 2020Imagine counting all your ancestors as you trace your family tree back in time.
that"if you were alive at the genetic isopoint, then you are the ancestor of either everyone alive today or no one alive today."humanity's genetic isopoint to be between 5300 B.C. and 2200 B.C. This means that the ancestor responsible for blue eyes lived in a time that predated, or was close to, humanity's global isopoint.
Eiberg, Hans, et al."Blue Eye Color in Humans May Be Caused by a Perfectly Associated Founder Mutation in a Regulatory Element Located within the HERC2 Gene Inhibiting OCA2 Expression." Human Genetics, vol. 123, no. 2, Mar. 2008, pp. 177–87. Springer Link, https://doi.org/10.1007/s00439-007-0460-x. Rohde, Douglas L. T., et al."Modelling the Recent Common Ancestry of All Living Humans." Nature, vol. 431, no. 7008, Sept. 2004, pp. 562–66. www.nature.com, https://doi.org/10.1038/nature02842.
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