Sexual selection leads to non-random mating -- a violation of the 5th important assumption of the Hardy-Weinberg Law.
The Hardy-Weinberg equilibrium can be disrupted by deviations from any of its five main underlying conditions. Therefore mutation, gene flow, small population, nonrandom mating, and natural selection will disrupt the equilibrium.
The Hardy-Weinberg equilibrium principle describes the unchanging frequency of alleles and genotypes in a stable, idealized population. In this population we assume there is random mating and sexual reproduction without normal evolutionary forces such as mutation, natural selection, or genetic drift.
Hardy-Weinberg equilibrium: the condition in which both allele and genotype frequencies in a population remain constant from generation to generation unless specific disturbances occur.
From the given conditions, these are often violated because many populations are small, movement in or out across population always occur, mating is not random (sexual selection), mutations do occur and natural selection occurs.
Mutations must not occur to introduce new alleles to the population. No gene flow can occur to increase variability in the gene pool. A very large population size is required to ensure allele frequency is not changed through genetic drift. Mating must be random in the population.
When a population is in Hardy-Weinberg equilibrium for a gene, it is not evolving, and allele frequencies will stay the same across generations. There are five basic Hardy-Weinberg assumptions: no mutation, random mating, no gene flow, infinite population size, and no selection.
It does not specifically selection for traits that are fit for the environment. Hence, answer is "Genetic drift"
Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population violates the Hardy-Weinberg assumptions, and evolution occurs.
They are said to be in Hardy-Weinberg equilibrium: - Very large population: No genetic drift can occur. -No immigration or immigration: No gene flow can occur. -No mutations: No new alleles can be added to the gene pool.
5 Conditions for Hardy-Weinberg Equilibrium Isolated population. large population. vary population. random mating. every individual has equal chance to survive; no natural selection.
Terms in this set (106) What must be true for a population to be in Hardy-Weinberg equilibrium? There must be random mating in the population; there must be an infinite population size; and there must be no evolution occurring (no natural selection, no genetic drift, no migration and no mutation).