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« on: Thursday 08 March 12 20:43 GMT (UK) »
I've received a fair amount of requests on my comment so here we go - I don't know yet if there is a maximum length for posts so I may have to spread this out.
6,805,700,000
Estimated Current World Population 2010
How Many Ancestors Do We Have?
The usual estimate is based upon a simple progression
SELF
2 PARENTS
4 GRANDPARENTS
8 GREAT-GRANDPARENTS
16 GREAT-GREAT-GRANDPARENTS
32 GREAT-GREAT-GREAT-GRANDPARENTS
64 GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
128 GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
256 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENT
512 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
1024 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
Predictably, this is called the “Pyramid Model”
However – we have a problem!
Let’s continue a wee bit:
Gen. 12: 2048 – abt. 360 years ago (+/- 70)
Gen. 13: 4096 – abt. 390 years ago (+/- 70)
Gen. 14: 8192 – abt. 420 years ago (+/- 70)
Gen. 15: 16384 – abt. 450 years ago (+/- 70)
Gen. 16: 32768 – abt. 480 years ago (+/- 70)
Gen. 17: 65536 – abt. 510 years ago (+/- 70)
Gen. 18: 131072 – abt. 540 years ago (+/- 70)
Gen. 19: 262144 – abt. 570 years ago (+/- 70)
Gen. 20: 524288 – abt. 600 years ago (+/- 70)
See where we’re going yet?
6,805,700,000
Estimated World Population 2010
Generation 30 using the Pyramid
WE SHOULD HAVE
536,870,912 ancestors about 900 years ago!
4 Generations later about 1020 years ago
8,589,934,592
40 generations back at 30 years per generation about 1200 years ago
2,199,023,255,552
40 generations back at 30 years per generation, about 1200 years ago
2,199,023,255,552
THAT’S 2.2 TRILLION
Official estimate of total World population (ever to have lived)
About 106,000,000,000
JUST OVER 100 BILLION
We can’t have more ancestors than available people who have EVER lived.
I Think I've attached a graphic showing population data - so I'll continue.
So, depending on the years defining a “generation” at about 1200AD, using 30 years per generation, your “ancestors” surpass available people.
At 20 years per generation you are related to everyone before about 1500AD !
HOW CAN THIS BE?
IT CAN’T !!!!!
The Pyramid Theory assumes that no relations EVER married
This is impossible because the number of ancestors can never be more than the total population at a given time
Relations did marry, perhaps not in an Egyptian, Roman or Royal way, but subtly
The actual model we have to use is a “Diamond Model”
SELF
2 PARENTS
4 GRANDPARENTS
8 GREAT-GRANDPARENTS
16 GREAT-GREAT-GRANDPARENTS
32 GREAT-GREAT-GREAT-GRANDPARENTS
64 GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
128 GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
256 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENT
512 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
1024 GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
x G-G-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
x G-G-G-G-G-GREAT-GREAT-GREAT-GREAT-GREAT-GRANDPARENTS
x G-G-G-G-G-G-G-G-GREAT-GREAT-GREAT-GRANDPARENTS
x-G-G-G-G-G-G-G-G-G-G-G-GREAT-GRANDPARENTS
This can be displayed in a lateral branch of my own “Tree” from quite recently (second attachment)
But much more radically in the family tree of King Charles II of Spain (it's famous and you can look that up yourselves)
His Christmas and birthday lists must have been a nightmare!
Perhaps fortunately, a limited gene pool caused him to be too mad to worry!
If first cousins marry, any children lose 2 shared Great-grandparents, 4 shared Great-Great-Grandparents Etc.
If second cousins marry, any children will lose 2 shared Great-Great-Great-grandparents, 4 shared Great-Great-Great-Great Grandparents Etc.
This is called Pedigree Collapse
Charles’ great-great-great or (add-great-great, depending along which lineage one counts) Grandmother, was two of Charles' 16 great-great-great-grandmothers, six of his 32 great-great-great-great-grandmothers, and six of his 64 great-great-great-great-great-grandmothers.
In fact out of a possible 64 individuals Charles had 12 individual 4x great-grandparents
Only TWO in the “Direct” paternal line out of a possible 32!!!!!
Humans, as we would recognize them today, appeared about 50,000 years ago. But some Human DNA may be in existence from as early as 250,000 years ago.
Mitochondrial Eve about 140,000 years ago
Y-chromosomal Adam about 60,000 years ago
Don't know how to add another file so we'll break off here and start on a new thread