It sounds like you are thinking of the mitochondrial Eve idea. You probably would get zillions of hits for this. I haven't been following the discussion of that, but quickly found a good number of articles which touch on it at one of my favorite sites, you could link to one at http://www.answersingenesis.org/tj/v17/i1/events.asp.
Every living cell uses in-cell parts called mitochondria to power cell activities. A special form of the huge molecule DNA resides in mitochondria. Its precise makeup is decided by the genes inherited from the mother. The father's sperm doesn't effect this. Studies of the mitochondrial DNA came out that attempted to trace the slight mutational modifications to the precise sequence of mitochondrial DNA through maternal generations to learn the nature and geographic location of the first human mothers. The researchers indicated that it appeared that the data ran back to a single first mother in Africa some 150,000 or so years ago.
Not all reviewers have agreed with the mitochondrial Eve idea. When you hear that all scientists agree on something they can't demonstrate, you should suspect a conspiracy.
