Some of the very similar Neanderthal variants of genes are manifest as important phenotypic differences though. Traits ranging from hair straightness, sneezing

Some of the very similar Neanderthal variants of genes are manifest as important phenotypic differences though. Traits ranging from hair straightness, sneezing after dark chocolate, to severe COVID risk. Some alleles are now suddenly quite deleterious due to modern lifestyles, like the CHRN3 gene variant, but wasn't before widespread smoking.