IANAS (The S is for scientist) but I have read all kinds of things that lead me to conclude that I am far more closely related to ALL other humans (even black and asian) than the average person (and certainly the average racist) would suspect.
There seems to be a number of reasons for this: What I am sayting
The “going forwards” hypothesis":Human beings of all races are so genetically similar (and virtually identical under the skin) that many scientists postulate that the whole human race is descended from a very small group of a few dozen early creatures that survived some near extinction. Most species display much more variation than we do. While a blue-black seven-foot Watusi and a flaxen-blond Swedish girl may strike you as very different, I have read that they are far less different than different breeds of cats, for example.
The “going backwards” hypothesis: Most of us say we are “pure Irish” or “pure French” or “pure white” or “pure Chinese” by tracing through the male line on our family tree. But from a genetic point of view this is very misleading and artificial. I am the child of two people (not just my father), who were the children of four people (my granparents), who were the children of eight people, etc. Now then, counting for or five generations per century (people used to have children a lot younger than now) thirty generations of my ancestors takes me back to about the 12th to 14th centuries. But doubling my ancestors thirty times gives me a number in the BILLIONS!!! There were not billions of people on Earth at any time before the last century or so, right?
And that is just ME! What about you, gentle readers? If each of you is descended from billions of people, and there are about 6 billion people on Earth right now. . . .well do the math!
The only answer to this is that my family tree and yours are not trees at all. The idea that you and I have distinct “trees” of ancestry is absurd. You would have to do a giganic family “bush” for the whole humn race at once.
If you are going to trace your ancestry through both your father and mother, then you would be shown as a dot with your name next to it representing one person at the top of the page. So would every other human being on earth. Now then, two lines would lead down from my dot to two dots identified as with mother and father’s names. And then two lines from each of them to my four grandparents, and so on.
So, in tracing back my ancestry, I would at each ancestor have the choice of following the male or female line to the next ancestor.
As I understand it, two things would occur. I would start to notice after a couple of centuries that the same persons keep coming up as my ancestors in different roles depending on what lines you follow to reach them. And secondly, we would discover that you and I and every other human being on Earth have literally hundreds and even thousands of common ancestors.
THAT is why there were not billions of people on Eath in the 12th century!
I would be pleased if any scientists or genetics experts out there could tell me if any of this is right or am I just spoouting bullshit?