#45

"Genetic Adam" Lived Much Earlier Than Previously Thought

Our most recent common ancestor is 150,000 years old.

By Jeff Wheelwright|Monday, January 20, 2014
RELATED TAGS: GENETICS, HUMAN ORIGINS
Genetic-Adam
Genetic-Adam
Lonely/Shutterstock

“Genetic Adam” is the popular term for the common male ancestor of all humanity. Clues to his identity lie within the Y chromosome, a stretch of genes that fathers pass down nearly intact to their sons. Over generations, slight genetic changes occur in Y chromosomes that can be read, like a timepiece, to estimate the age of this original forebear.

Three new studies calculated that our progenitor lived about 150,000 years ago — much earlier than prior estimates suggested. The most comprehensive of these, published in August by a Stanford team, analyzed men from nine widely spaced populations, covering 10 million bases (DNA letters) on their Y chromosomes.

The name “genetic Adam” is somewhat misleading, says David Poznik, lead author of the Stanford study: The more precise term is “most recent common ancestor,” he says. This early man was, after all, surrounded by other men whose Y chromosomes were lost to history because their male lineages died out.

[This article originally appeared in print as "ID for 'Genetic Adam'."] 

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