Posted on 02/28/2007 1:34:33 PM PST by blam
"Unique Diversity"?.....
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The ones who are Muslim have been inbreeding for centuries.
So, any explanantion for this seeming contradiction in mtDNA diversity? Would polygamy 'splain it?
Hey--I figgered you were our resident expert in genetics.
Cousins marrying cousins and uncles marrying aunts/nieces does lead to severe mental and physical maladies...and Muslims exhibit all them.
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I'm not physically or mentally deficient. Nor am I Muslim. But genealogy is fun for me because so many of my lines converge on common ancestors. Us Southerners had ancestors who lived in rural areas with limited access to new blood. We did ok.
Contradiction? I think marriage arrangements don't influence things,only the egg has mtDNA.
Indeed--the cytoplasm of the sperm is negligible, so (essentially) all the mtDNA comes from the ova. The contradiction would be why, in this limited area, would there be so much diversity of mtDNA? One way to possibly explain it would be for the dominant males to raid other islands and bring captive women back--women who would have different genetic lines.
You cannot compare your situation (amongst "Southerners" but simlar to many rural communities in all parts of the US) with first cousin marriage as a normal routine occurence among Muslims.
Many of my ancestors are married first cousins. Three of my father's four grandparents were cousins to each other, two of them first cousins. The practice has gone back to nearly three hundred years that I can uncover, and I suspect it's longer than that.
Interbreeding wouldn't result in specific mtDNAs on "specific islands and even specific populations". This has to be the result of population isolation and I'm guessing long isolation at various locals. Long isolation accounts for the high number of mtDNA mutations not found in other populations.
FWIW Melanesians have the greatest genetic distance from Africans according to Cavalli-Sforza.
Yes--isolation and then rearranging the female lines through raids. It's also interesting to note that Africans have a great amount of genetic diversity.
I don't see any evidence here that the female lines move around. If the female lines were rearranged wouldn't the mtDNAs be spread all over Melanesia instead of isolated to islands and even sections of populations? The total genome of Melanesia may have a lot of diversity but apparently at any particular local it's not diverse.
OK--I see your point. But in Africa, they take the high level of diversity as meaning that they are the oldest populations, but if as you say the Melanesians are the farthest from the Africans, it does not make sense that the Melanesians would be a very old line.
I was told that Africa has more genetic diversity than the rest of the world combined. I guess Melanesia must be second. If you believe in molecular clocks, than the oldest population will have the DNA that the daughter populations will have variants of. Since it takes time to accumulate mutations, the more recent populations splits will have fewer variants and the older population splits will have more. Melanesians have more therefore they're older.
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