How does nonrandom mating affect allele frequencies?

How does nonrandom mating affect allele frequencies?

That is an interesting result: non-random mating, even in the most extreme form of self- fertilization, has no effect on allele frequency. Selfing causes genotype frequencies to change as the frequency of homozygotes increases and the frequency of heterozygotes decreases, but the allele frequency remains constant.

How does assortative mating affect genotype frequencies?

Some types of assortative mating are also similar to inbreeding in that they do not change allele frequencies but do affect genotype frequencies. Many assortative mating models do change allele frequencies because the proportion of individuals in the matings differs from the proportion in the population.

How does non-random mating affect evolution?

As the discriminated traits are genetically inherited, evolution is usually a consequence. Non-random mating can act as an ancillary process for natural selection to cause evolution to occur. Any departure from random mating upsets the equilibrium distribution of genotypes in a population.

How does non-random mating affect the Hardy-Weinberg equilibrium?

Non-random mating. Non-random mating won’t make allele frequencies in the population change by itself, though it can alter genotype frequencies. This keeps the population from being in Hardy-Weinberg equilibrium, but it’s debatable whether it counts as evolution, since the allele frequencies are staying the same.

What is an example of non-random mating?

Non-random mating–sexual selection, etc. Example: selection produces changes in expected gene frequencies between new-born individuals and adult survivors. Hardy-Weinberg is the statistical “null hypothesis” used for testing population genetics data.

Does non random mating cause less genetic diversity?

One form of nonrandom mating is inbreeding, which occurs when individuals with similar genotypes are more likely to mate with each other rather than with individuals with different genotypes. Whereas inbreeding can lead to a reduction in genetic variation, outbreeding can lead to an increase.

Why does only random mating meiosis fertilization result in no changes in allele frequency in a population?

Explain why meiosis and random fertilization alone will not alter the frequency of alleles or genotypes in a population. Meiosis and random fertilization alone do not alter the gene pol because the genes do not actually change. The genes keep going back into the gene pool.

What scenario causes gene flow?

Gene flow is caused by a significant change in the population of individuals due to the addition of other individuals whose alleles are slightly different from those of the existing individuals.

How does gene flow counteract natural selection?

Gene flow into a population can counteract gene frequency changes because of selection, imposing a limit on local adaptation. Thus, although the potential for adaptation might be greatest in poor and sparsely populated environments, gene flow will counteract selection more strongly in such populations.