Claim: At the MHC region, Mexicans have excessive African ancestral alleles compared to the rest of the genome, representing one of the strongest known selection signals observed in humans.
Verdict: Correct (95% confidence)
Explanation: According to a study published on PubMed by Q Zhou (2016), Mexicans have excessive African ancestral alleles at the MHC region compared to the rest of the genome, which is a hallmark of recent selection. This finding is supported by multiple sources, including a publication on PMC and PLOS Genetics, which confirm the presence of strong selection signals at the MHC region in Mexicans. These sources collectively establish that the genetic pattern observed is one of the strongest known selection si...