Ancestry‑specific polygenic trends

When researchers plot polygenic scores through deep time, different ancestral components (western hunter‑gatherer, early farmers, Steppe pastoralists) can carry distinct temporal trajectories; modelling a single ancestry‑corrected time slope can therefore remove or distort real evolutionary change tied to those ancestries. The result is a risk that selection scans or historical interpretations will understate or misattribute which groups — and which times — drove change in traits like height or educational‑attainment PGS. — This matters because methodological choices in ancient‑DNA studies shape public and political narratives about human biological change, hereditarian claims, and the meaning of apparent genetic differences across populations and time.