Drax,
Archaeology, mtDNA, and Y DNA connect Bronze-Iron age IE North Asians to Yamna and Bronze age central Euros. Even though their pigmentation was radically different from Yamna(of the samples we have so far) they were probably very similar genetically. Pigmentation should not be put at the same level as genetic DNA markers and archaeology, because it is prone to change.
Yes and no, Mtdna don't give you too much info about a population, Corder Ware culture and WHG have the same mtdna, but different haplogroup Y, Andronovo have the haplogroup R1A; Yamna R1b, the Yamna population tested for their dark or light features (samples from the 2014 study), we don't have for the moment their haplogroup Y, in other words, we are not sure of their identity.
Don't forget that these populations were patriarcal; it's not rare to change their women for create an alliance etc...; for examples this excellent article about the link between Caucasian languages and Indo-Europeans:
http://kinshipstudies.org/2012/07/0...ypology-kinship-terms-and-autosomal-genetics/
For the Pigmentation and the genetic markers, not really, we know that these traits are from parents (see the common ancestor behind blue eyes etc...).
It isn't as simple as Pop A is 20% WHG and therefore has ~20% blue eyes. If that was true why do South Dutch have over 50% blue eyes and around 30% WHG? Eye color frequencies can go up and down and up and down.
Yes, that my problem, lol, I don't understand how this recessive trait can be today; in every europeans, it's dormant genes, something like that; really there are something "weird" because they are recessive.
For example in USA blue eyes will disappear sooner or later:
http://www.nytimes.com/2006/10/18/world/americas/18iht-web.1018eyes.3199975.html?_r=0
http://genetics.thetech.org/ask/ask355
I don't see will all these variants, blue eyes seem to be multiplied during the bronze age, specially with the indo-europeans.
I have just read a really weird info from another board, about an amerindian tribe very isolate (so not mixed with Europeans), the karitiana, with the locus for blue eyes (rs12913832, see the link for more details); but are all brown dark eyed; that here:
http://www.anthrogenica.com/showthr...0-000-Years-Ago-in-the-Black-Sea-Region/page5
http://www.anthrogenica.com/showthr...0-000-Years-Ago-in-the-Black-Sea-Region/page6
So I guess a gene don't mean you have necessary blue eyes (?); that could explain how dark skinned peoples like WHG has the genes (or some of them, that not clear) for blue eyes, but without necessary to have them "physically" (blue eyes are linked with white skin and maybe other factors, genes etc...).
edit: For this debate with blue eyes/WHG/indo-europeans I will quote Eupedia:
"Mesolithic Europeans from Spain and Luxembourg have been confirmed to have possessed the HERC2 mutation for blue eyes (see
Olade et al. (2014) and
Lazaridis et al. (2014)). This mutation is also found in parts of Asia settled by the Proto-Indo-European speakers belonging to the paternal lineages
R1a and
R1b, including the Altai, southern Siberia, Central Asia, Iran and the Indian subcontinent. Since the the Proto-Indo-Europeans carried very different paternal lineages from Mesolithic Europeans (Y-haplogroups C, F and I), and only shared a few very old maternal lineages, like haplogroups U4 and U5, their HERC2 mutation could have been inherited from a common Paleolithic ancestor or passed on by two different groups of Neanderthals to separate Upper Paleolithic Homo sapiens."
That make an agreement between the two previous studies about the place of blue eyes (black sea with Indo-Europeans and/or WHG).
I won't be surprised if the genetically east-north Euro Late Neolithic/bronze age samples from Germany come out mostly dark skinned, dark haired, and brown eyed. They're still the ancestors of people in that region today.
I agree that wouldn't be a very big surprise, but the opposite too could be true, and in some way that my problem, with all the differents physical traits they seem to have; for me it's seem, and I'm agree with Maciamo and Alan, Andronovo and Corded are a different (but close) population that Yamna (we know they don't have the same haplogroup, one with R1a the other with R1b).