Why Study Populations and Gene Frequencies Genetic variability necessary for evolutionary success, 2. Measuring genetic variability at many loci can characterize a population 3. Variability of phenotypic and molecular traits are analyzedWhy Study Populations and Gene Frequencies 1. Genetic variability necessary for evolutionary success; 2. Measuring genetic variability at many loci can characterize a population; 3. Variability of phenotypic and molecular traits are analyzed