The Hardy-Weinberg principle, also known as the Hardy-Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.These influences include mate choice, mutation, selection, genetic drift, gene flow and meiotic drive.Because one or more of these influences are typically present in real populations, the Hardy-Weinberg principle describes an ideal condition against which the effects of these influences can be analyzed.