Final answer:
The Hardy-Weinberg Principle of Equilibrium is the concept that explains how allele and genotype frequencies remain constant in a population without evolutionary forces, such as natural selection or mutation, affecting them.
Step-by-step explanation:
The principle that states that the frequencies of alleles and genotypes in a population will remain constant from generation to generation, provided that only mendelian segregation and recombination of alleles are at work, is known as the Hardy-Weinberg Principle of Equilibrium. This principle assumes that there are no mutations, migration, genetic drift, natural selection, or gene flow affecting the population, and that the population size is infinitely large. While no real population can exactly satisfy these conditions, this principle provides a foundation for understanding the forces that can cause allele frequencies to change, thereby driving evolution.