As Homo Spaiens entered Europe they interbred with Neaderthals. Neaderthal genes appear to have helped Homo Sapiens to adapt to European climates and pathogens.
The complex history of immigration in Great Britian has challenged archaeologists to determine who modern Britians are descended from. Making it more challenging, archaeological artifacts, historical narrative, burial practices and now archaeogenetics all tell different stories.
Analysis of DNA of ancient Romans revealed they were genetically homogeneous until 7,000 B.C. when they began adopting farming. Diveristy increased more quickly with mobility in the bronze and iron ages.
