We just covered how the Y Chromosome Consortium formed and in 2002 published a united tree for the paternal Y-chromosome tree. The other thing they outlined in their 2002 paper was the ways the tree can change over time. Today's post will go over these.
It was the beginning of the 21st century. Family Tree DNA and Oxford Ancestors were just getting started. Use of the human male sex chromosome DNA, the Y-chromosome DNA, for population history research was taking off for academic researchers.