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07-Feb-2020 17:15 by 9 Comments

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But why is it still around at minor allele level frequencies?

If you imagine that it was fixed in some populations, and then admixture resulted in the allele segregation, then there should be LD around the SNP too.

That’s because presumably the blonde allele comes from a common ancestor, which just happened to be over-sampled in a high drift regime.

Even if it wasn’t a selective sweep, flanking SNPs would still be transmitted at high frequency with the causal variant through drift.

But all this speculation is now a historical curiosity.

The results are widely known from conference presentations that have been reported, but finally the paper is out in Naturally blond hair is rare in humans and found almost exclusively in Europe and Oceania.

This in itself should make us skeptical of the model of European admixture.

Additionally, blue eyes, which exhibits a higher frequency in Europeans than blonde hair, is not similarly common in these populations.It is noted in the text that the authors did not find evidenc of high LD in their tests for natural selection, XP-EHH or i HS.These tests are cued to pick up relatively recent selective events, on the order of ~10,000 years or so.“This whole area seems to have been populated by very small groups of people making it across these stepping-stone islands, so you do have very dramatic effects in fluctuations of gene frequency.” It is absolutely correct that Oceanian populations exhibit a lot of evidence of small effective population, and so are subject to random genetic drift.In this model the frequency of ~0.25 for the allele which results in bondlism in the homozygote in the Solomon islands is high as it is due to a drift event up in frequency from an initial variant mutation. The first is a somewhat technical one: if the high frequency in the Solomons is due to rapid rise in frequency due to large generation-to-generation fluctuations, you’d expect to see some linkage disequilibrium in the region of .The key though is to note that the specific mutation is not found in Europeans. The extremely close correspondence between the genotype and the trait, and the lack of similarity in the variants between Europeans and Oceanians, ends debate on questions of the heritability and possible exotic origin of the trait in Oceanians. So how did the Oceanians come to have such a high frequency of this trait?