What are the effects of assortative mating on genotype frequencies?
Assortative mating alone is not expected to change the frequencies of alleles, or ancestry fractions in the case of our study, within a population. Assortative mating does, however, change genotype frequencies, resulting in an excess of homozygous genotypes.
Does positive assortative mating affect allele frequencies?
Inbreeding and assortative mating do not dramatically alter allele frequencies. Highly significant consequences for the evolution of populations.
What is the effect of assortative mating?
Assortative mating has reproductive consequences. Positive assortative mating increases genetic relatedness within a family, whereas negative assortative mating accomplishes the opposite effect.
What effect does increasing assortative mating have on the genotype proportions in this population?
If there is completely assortative mating (i.e., genotypes only mate with the same genotype) then each generation the frequency of homozygous genotypes will increase and the frequency of heterozygous genotypes will decrease.
How different kinds of mating affect gene and genotype frequency?
Genotype diversity is affected by the mating system (inbreeding organisms have lower genotype diversity than outcrossing), reproduction system (sexual organisms have higher diversity than asexual organisms), and selection.
What is an example of assortative mating?
assortative mating, in human genetics, a form of nonrandom mating in which pair bonds are established on the basis of phenotype (observable characteristics). For example, a person may choose a mate according to religious, cultural, or ethnic preferences, professional interests, or physical traits.
Does assortative mating increase genetic diversity?
Assortative mating has been suggested to result in an increase in heritability and additive genetic variance through an increase in linkage disequilibrium. … However, when the proportion of assortative mating was similar to that found in some studies, the amount of linkage disequilibrium was quite low.
How does positive assortative mating affect the heritability estimate?
From the population genetics perspective, assortative mating can affect heritability estimates, create correlations among traits that were initially unrelated and affect trait variance within and between families22.
How does nonrandom mating impact allele frequencies in the population?
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.
Is assortative mating an evolutionary mechanism?
Assortative Mating as a Mechanism for Rapid Evolution of a Migratory Divide.