Analysis of information sources in references of the Wikipedia article "تکگروه دیانای کروموزوم Y انسانی" in Persian language version.
Around 7000 years ago - all the way back in the Neolithic - something really peculiar happened to human genetic diversity. Over the next 2,000 years, and seen across Africa, Europe and Asia, the genetic diversity of the Y chromosome collapsed, becoming as though there was only one man for every 17 women.