African-American’s Y chromosome sparks shift in evolutionary timetable

The following is an excerpt.

Scientists say an African-American male’s odd genetic signature suggests that the human Y chromosome’s lineage goes back further in time than they thought — perhaps due to interbreeding with other populations such as Neanderthals.

“This really upsets a lot of ideas, but at the same time, it’s understandable if we accept that human populations were structured in the past so that there were little pockets of diversity,” said Michael Hammer, an evolutionary biologist at the University of Arizona who is one of the authors of a study published in the American Journal of Human Genetics.

View the original article here: African-American’s Y chromosome sparks shift in evolutionary timetable

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