Panmixia

panmicticrandom matingpanmixisglobal panmictic populationpanmictiapanmictic populationpanmixicpanmixy
Panmixia (or panmixis) means random mating.wikipedia
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Mating

matematescopulation
In genetics, random mating involves the mating of individuals regardless of any physical, genetic or social preference.
For animals, mating strategies include random mating, disassortative mating, assortative mating, or a mating pool.

Population

populationspopulacepopulated
In simple terms, panmixia (or panmicticism) is the ability of individuals in a population to interbreed without restrictions; individuals are able to move about freely within their habitat, possibly over a range of hundreds to thousands of miles, and thus breed with other members of the population.
This failure of panmixia leads to two important changes in overall population structure: (1) the component Gamo demos vary (through gamete sampling) in their allele frequencies when compared with each other and with the theoretical panmictic original (this is known as dispersion, and its details can be estimated using expansion of an appropriate binomial equation); and (2) the level of homozygosity rises in the entire collection of Gamo demes.

Hardy–Weinberg principle

Hardy-Weinberg equilibriumHardy-Weinberg principleHardy–Weinberg equilibrium
Random mating is a factor assumed in the Hardy–Weinberg principle and is distinct from lack of natural selection: in viability selection for instance, selection occurs before mating. In attempting to describe the mathematical properties of structured populations, Sewall Wright proposed a "factor of Panmixia" (P) to include in the equations describing the gene frequencies in a population, and accounting for a population's tendency towards panmixia, while a "factor of Fixation" (F) would account for a population's departure from the Hardy-Weinberg expectation, due to less than panmictic mating.
* Random mating.

Amegilla dawsoni

Dawson's Burrowing Bee
Dawson's Burrowing bee, Amegilla dawsoni, may be forced to aggregate in common mating areas due to uneven resource distribution in its harsh desert environment.
This resource pressure has been implicated in forcing the bees to be panmictic.

Monostroma

A panmictic population of Monostroma latissimum, a marine green algae, shows sympatric speciation in southwest Japanese islands.
Largest phylogeographic assessment of this genus yet conducted in SW Japan revealed existence of sympatric speciation in a panmictic population; the first report of sympatric speciation in algae

Sympatric speciation

sympatricsympatrysympatrically
A panmictic population of Monostroma latissimum, a marine green algae, shows sympatric speciation in southwest Japanese islands.
Although panmictic, the molecular phylogenetics using nuclear introns revealed staggering diversification of population.

Pantala flavescens

Wandering Glider
Pantala flavescens should be considered as a global panmictic population.
Another study concluded that Pantala flavescens as a near global panmictic population.

Population genetics

population geneticistevolutionary geneticspopulation genetic
Because of physical barriers to migration, along with the limited tendency for individuals to move or spread (vagility), and tendency to remain or come back to natal place (philopatry), natural populations rarely all interbreed as may be assumed in theoretical random models (panmixy).

Genetics

geneticgeneticistgenetically
In genetics, random mating involves the mating of individuals regardless of any physical, genetic or social preference. This assumes that there are no mating restrictions, neither genetic nor behavioural, upon the population and that therefore all recombination is possible.

Behavior

behaviourbehavioralbehaviors
This assumes that there are no mating restrictions, neither genetic nor behavioural, upon the population and that therefore all recombination is possible.

Wahlund effect

population subdivision
The Wahlund effect assumes that the overall population is panmictic.

Natural selection

selectionselectiveselected
Random mating is a factor assumed in the Hardy–Weinberg principle and is distinct from lack of natural selection: in viability selection for instance, selection occurs before mating. As time progresses, natural selection and genetic drift will slowly move each population toward genetic differentiation that would make each population genetically unique (that could eventually lead to speciation events or extirpation).

Habitat

habitatsmicrohabitatnatural habitat
In simple terms, panmixia (or panmicticism) is the ability of individuals in a population to interbreed without restrictions; individuals are able to move about freely within their habitat, possibly over a range of hundreds to thousands of miles, and thus breed with other members of the population.

Species

specificspecific epithetspecific name
To signify the importance of this, imagine several different finite populations of the same species (for example: a grazing herbivore), isolated from each other by some physical characteristic of the environment (dense forest areas separating grazing lands).

Herbivore

herbivorousherbivoresherbivory
To signify the importance of this, imagine several different finite populations of the same species (for example: a grazing herbivore), isolated from each other by some physical characteristic of the environment (dense forest areas separating grazing lands).

Forest

forestsconiferous forestsforested
To signify the importance of this, imagine several different finite populations of the same species (for example: a grazing herbivore), isolated from each other by some physical characteristic of the environment (dense forest areas separating grazing lands).

Genetic drift

driftrandom genetic driftrandom drift
As time progresses, natural selection and genetic drift will slowly move each population toward genetic differentiation that would make each population genetically unique (that could eventually lead to speciation events or extirpation).

Speciation

divergedspeciatedspeciate
As time progresses, natural selection and genetic drift will slowly move each population toward genetic differentiation that would make each population genetically unique (that could eventually lead to speciation events or extirpation).

Local extinction

extirpatedextirpationlocally extinct
As time progresses, natural selection and genetic drift will slowly move each population toward genetic differentiation that would make each population genetically unique (that could eventually lead to speciation events or extirpation).

Hybrid (biology)

hybridhybridshybridization
However, if the separating factor is removed before this happens (e.g. a road is cut through the forest), and the individuals are allowed to move about freely, the individual populations will still be able to interbreed.

Sewall Wright

WrightSewall G. WrightS. Wright
In attempting to describe the mathematical properties of structured populations, Sewall Wright proposed a "factor of Panmixia" (P) to include in the equations describing the gene frequencies in a population, and accounting for a population's tendency towards panmixia, while a "factor of Fixation" (F) would account for a population's departure from the Hardy-Weinberg expectation, due to less than panmictic mating.

F-statistics

F''-statisticsAVKF ST
In this formulation, the two quantities are complementary, i.e. P = 1 - F. From this factor of fixation, he later developed the F statistics.

Genetic diversity

variationgenetically diversegenetic variation
Panmixia allows for species to reach genetic diversity through gene flow more efficiently than monandry species.

Monandrous

monandry
Panmixia allows for species to reach genetic diversity through gene flow more efficiently than monandry species.