Any departure from random mating
upsets the equilibrium distribution of genotypes in a population
. This will occur whether mate selection
How does random mating contribute to genetic variation?
Mendelian segregation
has the property that random mating results in an equilibrium distribution of genotypes after only one generation, so genetic variation is maintained. … The equilibrium is the direct consequence of the segregation of alleles at meiosis in heterozygotes.
What is random mating in population genetics?
Random mating – Random mating refers
to matings in a population that occur in proportion to their genotypic frequencies
How non random mating can affect the genetic composition of population?
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 are the factors affecting population genetics?
The four factors that can bring about such a change are:
natural selection, mutation, random genetic drift, and migration into or out of the population
.
Why does random mating occur?
The effect that is of concern is genetic drift. Genetic drift is a change in gene frequency
Why is random mating important?
Any departure from random mating
upsets the equilibrium distribution of genotypes in a population
. A single generation of random mating will restore genetic equilibrium if no other evolutionary mechanism is operating on the population.
Why is human mating usually not random?
In all human populations, people usually select mates
non-randomly for traits that are easily observable
. Cultural values and social rules primarily guide mate selection
Does random mating increase heterozygosity?
Disassortative mating will tend to increase heterozygosity
(put unlike alleles together) without affecting gene frequencies
Is random mating based on adaptations?
When natural selection is considered as a process, from my point of view, it is a process that occur as a result of all mutations, migrations, genetic drift, random mating. … But only
natural selection is considered as an adaptation method
, when the others are considered to be influences on the evolution of the species.
What are the 5 factors that influence genetic variability in a population?
Some of the major factors which affect the genetic equilibrium and induce the variability in population are as follows: (A)
Mutations
(B) Recombinations during Sexual Reproduction (C) Genetic Drift (D) Gene Migration (Gene Flow) (E) Natural Selection.
What is the main purpose of population genetics?
Population genetics seeks
to understand how and why the frequencies of alleles
How does population size affect genetic drift?
Small populations tend to lose genetic diversity more quickly than large populations due
to stochastic sampling error
(i.e., genetic drift). This is because some versions of a gene can be lost due to random chance, and this is more likely to occur when populations are small.
Is random mating likely to result in genetic drift?
Random mating
prevents allele frequencies
to change, while genetic drift and natural selection do the opposite.
What is an example of non-random mating?
Nonrandom mating is a phenomenon that individuals choose their mates based on their genotypes or phenotypes. Examples of this kind of mating occur in species like
humans, peacocks, and frogs
. Nonrandom mating can happen in many different forms, one being assortative mating.
Why is random mating important to Hardy-Weinberg?
If allele frequencies differ between the sexes
, it takes two generations of random mating to attain Hardy-Weinberg equilibrium. Sex-linked loci require multiple generations to attain equilibrium because one sex has two copies of the gene and the other sex has only one.
