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Population Genetics concerns the genetic composition of populations and how this variation changes over time, driven by processes such as mutation, migration, genetic drift, and natural selection. It delves into the distribution and frequency of different alleles within populations, as well as the impact of these factors on evolutionary dynamics. This field is a crucial component of gene expression studies, elucidating patterns of genetic diversity and their implications for phenotypic traits and disease susceptibility in various organisms. By examining genomic data at the population level, researchers can uncover meaningful insights into the forces shaping genetic architecture and adaptation, furthering our understanding of life's complexity and diversity within the broader context of Science, Genetics, and Gene Expression.