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We all are blessed with two parents, four grandparents, eight great grandparents and so on. If the average generation is twenty-five years, in 1200 years (back to 800 AD, the time of Charlemagne) each person has 281.5 trillion grandparents. That's the way geometric progressions work. The number of grandparents doubles every 25 years and in 12OO years or 48 generations, 281.5 trillion names would be on your pedigree.
But hold on, you say! In 800 AD there were not that many people on the whole planet. How could I - or any person - have that many grandparents? The answer is that while you must have this number of grandparents, given the imperatives of human procreation, they are not all different people. Some names on your pedigree appear twice, three times or even hundreds of times in the 1200 years. Cousins have married and, if they were first cousins, their offspring will have only six great grandparents rather than the normal eight. Those offspring will have pedigrees which have "collapsed" from 8 to 6 or 25% in the 4th generation back. That 25 % collapse will be present in each and every one of the 44 generations back to 800 AD. The same phenomenom occurs when 2nd, 3rd, 4th or 5th cousins marry although the percentage ‘collapse’ is not as dramatic. A dramatic collapse occurs when siblings marry as was the norm for Egyptian pharaohs and Inca kings. In those cases there is a 50% collapse (from 4 to 2) at the 3rd generation, the grandparents.
Originally posted by Jenna
Seems to me that all of that fails to take into account all the people who had multiple children. One plus one doesn't always equal two when it comes to procreation. Sometimes it equals two and sometimes it equals 12, vastly cutting down the number of ancestors required for all 6 billion of us on the planet.
Originally posted by dreamwalker74
I'm sorry Jenna, honestly I have not checked my U2U period, I get on here when I can. I will check it now.
Still do you believe in the "Origin country" theory that we came out of a base homo sapien in africa, either during the time of Pangea, or a time when land bridges were prevalent?
I honestly believe that if thier wasn't a mass extinction event every 18,000 years or so, that this is the only way the current way of life could be possible, I believe we would have litterally run out of space tens of thousands of years ago.