Genetic math

[RenHoek]

Seems to me that I saw an article in the last 6 months where human genes were traced mathematically back to common ancestors around 6000 years ago. Anyone recall or have a link to this?

 

[rmwilliamsll]

Seems to me that I saw an article in the last 6 months where human genes were traced mathematically back to common ancestors around 6000 years ago. Anyone recall or have a link to this?

This is not a scientific article.
the closest thing, afaik, is a genetic bottleneck at about 70kya with the human population down to between 2 and 10K individuals.
you can also google
"genetic eve" or "mitochrondrial eve"
and see a number of mitochrondrial studies showing common females at 120K-150K.
there is an excellent very readable book on the topic in the _Journey of Man_ by Spenser Wells, i believe that there is a DVD with the same information if you prefer.

the human population was well distributed around the world 6kya..

 

[RenHoek]

I thank you for your help in the search criteria. This is what I was after.

http://www.usatoday.com/news/nation/2006-07-01-family-tree_x.htm

 

[rmwilliamsll]

I thank you for your help in the search criteria. This is what I was after.

http://www.usatoday.com/news/nation/2006-07-01-family-tree_x.htm

it would be worth pursuing this:

http://humphrysfamilytree.com/ca.math.html
http://www.artsci.wustl.edu/~landc/html/cann/
http://en.wikipedia.org/wiki/Genetic_genealogy
http://en.wikipedia.org/wiki/The_Seven_Daughters_of_Eve
from: http://en.wikipedia.org/wiki/Most_recent_common_ancestor

However, Rohde, Olson, and Chang (2004), using a non-genetic model, estimated that the MRCA of all living humans may have lived within historical times (3rd millennium BC to 1st millennium AD). Rhode (2005) refined the simulation with parameters from estimated historical human migrations and of population densities. For conservative parameters, he pushes back the date for the MRCA to the 6th millennium BC (p. 20), but still concludes with a "surprisingly recent" estimate of a MRCA living in the second or first millennium BC (p. 27). An explanation of this result is that, while humanity's MRCA was indeed a Paleolithic individual up to Early Modern times, the European explorers of the 16th and 17th centuries would have fathered enough offspring so that some "mainland" ancestry by today pervades even remote habitats. The possibility remains, however, that a single isolated population with no recent "mainland" admixture persists somewhere, which would immediately push back the date of humanity's MRCA by many millennia. While simulations help estimate probabilities, the question can be resolved authoritatively only by genetically testing every living human individual.

Other models reported in Rohde, Olson, and Chang (2004) suggest that the MRCA of Western Europeans lived as recently as AD 1000. The same article provides surprisingly recent estimates for the identical ancestors point, the most recent time when each person then living was either an ancestor of all the persons alive today or an ancestor of none of them. The estimates for this are similarly uncertain, but date to considerably earlier than the MRCA, according to Rohde (2005) roughly to between 15,000 and 5,000 years ago.

nice background page:
http://www.duerinck.com/migrate.html

the big problem with what i am reading now is the confusion and conflation of the terms:
"descended from"
and
"related to"
he is consistently speaking about related to, yet all the YECists articles and most of the popular articles are drawing the parallel to mitochrondrial Eve and using the idea of descended from.

his 7Kya relation is just take a relation to everyone now living, not a last common ancestor.

btw:
the same kind of interesting data appears in both the Ghengis Khan genes and the Cohenate gene studies.