An interesting twist on classic Mendeliansim - a mixed race (African-American and Caucasian) US couple has given birth to twin girls. Rather than both being a 'blend', one girl looks decidedly dark-toned, whilst the other is fair. And the parents only really noticed after 2 or so weeks.
http://m.essentialbaby.com.au/baby/b...16-gmv9f8.html
Not a hard hitting genetics article; but amazing - and rather cute- nevertheless, IMO)
drobbah (02-25-2016)
this shows very well the concept of "races" is nonsense
Known ancestry: 92.6% German (66.8% North German), 4.7% Danish, 1.8% Czech, 0.8% Austrian, 0.1% Swiss.
EUROGENES K13: N German, N Dutch, DNK, SWE, NOR. Ancestry: Germanic 75%, Sweden 13%, Norway 11%, Baltic 1%. LM: NOR, DNK, NLD, N-DEU, SWE.
23andMe: NW Europe 82.5% (French/German 50.2%, Scandinavian 9.1%, British/Irish 3.2%), East Europe 11.5%, South Europe 1.5%. DNAL: NW Euro 81%, NE Euro 11%, Med 6.5%
Y-DNA: R1b/U152/Z36/CTS4333, Thuringia 1634, probably Alsace 1552, -- mt-DNA: H
In today's paper a Zimbabwe father and white Mum had two kids with different external racial features.
Here are two other cases -
http://www.cnn.com/2015/03/03/living...k-white-twins/
http://www.babycenter.com/0_strange-...te_10364936.bc
Too bad we don't have the biogeographical ancestry results of all of these cases. It would be cool to see if the physical characteristics matched the BGA or not.
Lugus (02-26-2016)
of course not.Originally Posted by ArmandoR1b
Mc Donald:
Most likely fit is 62.4% (+- 9.5%) Europe (various subcontinents)
and 37.6% (+- 9.5%) Mideast (various subcontinents)
Dodecad World9:
1 50% S_Italian_Sicilian +50% Dutch @ 1.083
2 50% German +50% S_Italian @ 1.126
3 50% Dutch +50% S_Italian @ 1.148
yeah it's possible for siblings to have drastically different skin and hair color
dp (03-14-2016)
I am, of course, not saying that there will be a 100% difference. Just that the difference is more than normal between siblings.. I have seen where siblings have a much larger continental difference in their BGA when one parent has DNA from a continent the other parent does not. I have also heard of an autosomal chromosome being passed down unchanged from a grandparent through a parent and the chromosomes with the physical characteristics could easily carry more of the respective BGA. These aren't identical twins so their autosomal DNA will be different. I am leaning towards the physical characteristics following the BGA.
Last edited by ArmandoR1b; 02-26-2016 at 03:30 AM.
Stories like this pop up once in a while. Someone should study these cases and provide a scientific explanation. A term already exists: atavism. See another interesting example from apartheid time South Africa:
https://abagond.wordpress.com/2009/0...white-parents/
Interesting, but sad.
My research has been showing that many white Americans born in the Colonies or the early days of the Republic had some African in them. I am sure that this led to a lot of situations similar to that in the article, I have seen various ways of coping in these cases where the offspring were darker than the parents, including disguising one's family as slaves.
Jack
I've seen the documentary on that South African girl.These stories really made me realize that race truly is a social construct!
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