> However, the absence of Neanderthal-derived patrilineal Y-chromosome and matrilineal mitochondrial DNA (mtDNA) in modern humans, along with the underrepresentation of Neanderthal X chromosome DNA, could imply reduced fertility or frequent sterility of some hybrid crosses, representing a partial biological reproductive barrier between the groups, and therefore species distinction.
> The genomes of all non-sub-Saharan populations contain Neanderthal DNA. Various estimates exist for the proportion, such as 1–4% or 3.4–7.9% in modern Eurasians, or 1.8–2.4% in modern Europeans and 2.3–2.6% in modern East Asians.
From Wikipedia:
However, around 2013-14 they either changed the number of SNPs they considered Neanderthal origin or their algorithm changed, and I was PISSED because I went from 95th percentile to 47th-ish myself.