Population stratification is the presence of a systematic difference in allele frequencies between subpopulations in a population possibly due to different ancestry, especially in the context of association studies. Population stratification is also referred to as population structure, in this context.
Read more about Population Stratification: Causes of Population Stratification, Population Stratification and Association Studies, Genomic Control
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“The broad masses of a population are more amenable to the appeal of rhetoric than to any other force.”
—Adolf Hitler (1889–1945)