All europeans carry to varying degrees three sets of genes, latest were the horse people who came in around 3000 BC from above the black sea. Earlier than these folk were the farmers who came from Turkey from about 7000-5000 BC. A third set of genes come from people who predate the younger dryas of about 11,000-10,000 bc. These people may not be white. But rather something closer to north asian—around the arctic circle—or even south central asian. The sami people of scandenavia may be a remnant of this. The indians of canada also carry a piece of their genetic code. The evidence for this comes from the similarities between the atlantic coast european solutrian people arrow points from 20,000 years ago and the arrow points of the clovis people who disappeared from north america during the younger dryas —along with a lot of megafauna. As well, there is genetic evidence. From wikipedia:
Sequencing of another south-central Siberian (Afontova Gora-2) revealed that “western Eurasian genetic signatures in modern-day Amerindians derive not only from post-Columbian admixture, as commonly thought, but also from a mixed ancestry of the First Americans.”[51] It is further theorized if “Mal’ta might be a missing link, a representative of the Asian population that admixed both into Europeans and Native Americans.”[52]
https://en.wikipedia.org/wiki/Genetic_history_of_indigenous_peoples_of_the_Americas
This article from the bbc elaborates on genetic commonality between europeans and american indians as told by sequencing the genes of the Mal’ta boy.
https://www.bbc.com/news/science-environment-25020958
Yes. My Carpatho-Rusyn great aunt had traces of Mongol features and was said to have a certain birthmark which was associated with Mongol genes.