"This result is wholly consistent with previous work showing higher overall levels of nucleotide variation in African populations than in Europeans."
"At each SNP, an individual can be homozygous for the ancestral allele (carrying zero copies of the mutant allele), heterozygous (carrying one copy of the mutant allele) or homozygous for the derived allele (carrying two copies of the mutant allele)." See Link
I agree with you that the sample is small, however the sample is consistent with the larger study between Africans and Europeans; and on which the whole theory (Out of Africa) of African anteriority relies. I have also noticed that the ancestral allele is represented by the DNA of the Chimpanzee; one wonders if the use of Gorilla DNA would not produce more heterozygous Europeans or Europeans homozygous for the ancestral allele, as in RhCE Europeans.
"Most mammals only have one Rhesus gene, whose position corresponds to the human RHCE gene. The RHD gene arose from the duplication of an ancestral Rhesus gene during mammalian evolution. An RHD deletion occurred (5) during the evolution of hominids, so that many modern humans completely lack the RHD gene. This haplotype is the leading cause of the D negative phenotype worldwide."
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