Gene Flow

In population genetics, gene flow (also known as gene migration) is the transfer of alleles or genes from one population to another.

Migration into or out of a population may be responsible for a marked change in allele frequencies (the proportion of members carrying a particular variant of a gene). Immigration may also result in the addition of new genetic variants to the established gene pool of a particular species or population.

There are a number of factors that affect the rate of gene flow between different populations. One of the most significant factors is mobility, as greater mobility of an individual tends to give it greater migratory potential. Animals tend to be more mobile than plants, although pollen and seeds may be carried great distances by animals or wind.

Maintained gene flow between two populations can also lead to a combination of the two gene pools, reducing the genetic variation between the two groups. It is for this reason that gene flow strongly acts against speciation, by recombining the gene pools of the groups, and thus, repairing the developing differences in genetic variation that would have led to full speciation and creation of daughter species.

For example, if a species of grass grows on both sides of a highway, pollen is likely to be transported from one side to the other and vice versa. If this pollen is able to fertilize the plant where it ends up and produce viable offspring, then the alleles in the pollen have effectively been able to move from the population on one side of the highway to the other.

Read more about Gene FlowBarriers To Gene Ears, Gene Flow in Humans, Gene Flow Between Species, Models of Gene Flow, Gene Flow Mitigation

Other articles related to "gene flow, genes, flow":

Regal Fritillary - Threats
... Also, smaller fragmented populations are susceptible to restricted gene flow and reduced genetic variability (Williams et al ... Habitat fragmentation and isolation can have large scale genetic effects on high gene flow species such as the regal fritillary ... There is an increased likelihood of population extirpation among high gene flow species experiencing habitat fragmentation (Williams et al ...
Evolution - Outcomes - Speciation
... Gene flow may slow this process by spreading the new genetic variants also to the other populations ... Instead, speciation results from the evolution of mechanisms that reduce gene flow between the two populations ... This form is rare since even a small amount of gene flow may remove genetic differences between parts of a population ...
Gene Flow Mitigation
... hybridized or wild native plant and animal populations by using gene flow mitigation usually through unintentional cross pollination and crossbreeding ... Reasons to limit gene flow may include biosafety or agricultural co-existence, in which GM and non-GM cropping systems work side by side ... large research programmes are investigating methods of limiting gene flow in plants ...
Merlin (bird) - Systematics - Subspecies
... be considered distinct species, with gene flow having ceased at least a million years ago, but probably more ... Population of northern Britain shows evidence of gene flow from subaesalon ... Latter population has some gene flow with aesalon ...
Hybrid Zone - Definition - Forms
... Thus novel genes flow from either side into the hybrid zone ... Genes can also flow back into the distinct populations through interbreeding between hybrids and parental (non-hybrid) individuals (introgression) ... Hybrid zones and gene flow do not inevitably lead to merging of the two populations involved, but the zones can instead be retained for thousands of years ...

Famous quotes containing the word flow:

    Logic and fact keep interfering with the easy flow of conversation.
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