Please understand this correctly. This refers to the "Y-cromosomal Adam", or the Most Recent Common Ancestor (MRCA) patrilinearly [1]. It is important to unders

Please understand this correctly. This refers to the "Y-cromosomal Adam", or the Most Recent Common Ancestor (MRCA) patrilinearly [1]. It is important to understand that some contemporaries of the MRCA are ancestors of no one in the current population. In other words, when that human lived, there were humans living concurrently that represented the same species (Homo) but their family line does not reach the current time. [1] http://en.wikipedia.org/wiki/Y-chromosomal_Adam http://en.wikipedia.org/wiki/Y-chromosomal_Adam