Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In genetic genealogy, the identical ancestors point is that point in a given population's past where each individual then alive turned out to be either the ancestor of every individual alive now, or to have no living descendants at all. This point lies further in the past than the population's most recent common ancestor. The MRCA had many contemporary companions of both sexes. Many of these contemporaries left direct descendants, but not all of them left an unbroken link of descendants all the way down to today's population. That is, some contemporaries are ancestors of no one in current population. The rest of contemporaries of MRCA may claim ancestry over a subset of current population, but not the entirety of current population. Because ancestors of MRCA are by definition also common ancestors, the further we push back in time, the more common ancestors we find, from this single MRCA. Eventually we will reach a point in the past where all humans can be divided into two groups: those who left no descendants today and those who are common ancestors of all living humans today. This point in time is termed the identical ancestors point.

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