Chapter 21, Problem 32P

In March 2013, the American Journal of Human Genetics published a report that an African-American man who submitted his genome for commercial genealogical analysis had a Y chromosome whose sequence was very different from that of other Y chromosomes that had been characterized previously. The investigators then found that certain males among the Mbo (an ethnic group in Cameroon) shared many of the polymorphisms first found in this African-American man. How do you think these findings would have altered estimates of when a man carrying the MRCA for the human Y chromosome would have lived on the earth?