Differentiate between gene flow and genetic drift?
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❤. Gene flow :
_______________
=> Gene flow refers to the change in allelic frequencies of a given population, when individuals migrate into a population ( immigration ) or from the population ( emigration ).
❤. Genetic drift :
_______________
=> Random changes in the allel frequencies of a population, occurring only by chance or events, constitute genetic drift.
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❤. Gene flow :
_______________
=> Gene flow refers to the change in allelic frequencies of a given population, when individuals migrate into a population ( immigration ) or from the population ( emigration ).
❤. Genetic drift :
_______________
=> Random changes in the allel frequencies of a population, occurring only by chance or events, constitute genetic drift.
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How are genetic drift and gene flow different?
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Jocelyne Mendez, Biology student
Answered Mar 16, 2016
Genetic drift is the changes in allele frequency in a gene pool. The bottleneck effect and founder effect are prime examples of genetic drift.
Gene flow, not to be confused with genetic drift, is what happens when organisms move into or out of a population. Gene flow either eliminates or introduces new alleles to the gene pool.
In essence,
Genetic drift is the changes in allele frequency in a population
Gene flow is the proccess of alleles moving from one population to another
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Magnus Pharao Hansen, Phd. Anthropology, Brown University
Answered Dec 7, 2017
Gene flow is the flow of genetic variants between populations due to contact and admixture.
Genetic drift is basically the same as the so-called “founder’s effect” where the frequencies of genes in a population changes across generations due to random effects. For example if a family splits from a main population and founds a new population then the alleles carried by the original family members will have a higher frequency in the resulting off-shoot population than in the original population.
An example would be a small population where there are 10 individuals with blue eyes, 10 individuals with brown eyes and 10 individuals with green eyes. One day an avalanche covers their camp and kills half the people, 5 people with blue eyes, 5 people with brown eyes and 10 people with green eyes survive. This means that due to this random event the frequency of the green eye genotype are suddenly in a majority - which will likely increase in subsequent generations. This shift favoring green eyes, wa snot a result of natural selection, but of a random effect that had nothing to do with the trait itself - this is an example of genetic drift.
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4 ANSWERS

Jocelyne Mendez, Biology student
Answered Mar 16, 2016
Genetic drift is the changes in allele frequency in a gene pool. The bottleneck effect and founder effect are prime examples of genetic drift.
Gene flow, not to be confused with genetic drift, is what happens when organisms move into or out of a population. Gene flow either eliminates or introduces new alleles to the gene pool.
In essence,
Genetic drift is the changes in allele frequency in a population
Gene flow is the proccess of alleles moving from one population to another
20.1k Views · View Upvoters
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Is this answer still relevant and up to date?
Upvote · 20
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Magnus Pharao Hansen, Phd. Anthropology, Brown University
Answered Dec 7, 2017
Gene flow is the flow of genetic variants between populations due to contact and admixture.
Genetic drift is basically the same as the so-called “founder’s effect” where the frequencies of genes in a population changes across generations due to random effects. For example if a family splits from a main population and founds a new population then the alleles carried by the original family members will have a higher frequency in the resulting off-shoot population than in the original population.
An example would be a small population where there are 10 individuals with blue eyes, 10 individuals with brown eyes and 10 individuals with green eyes. One day an avalanche covers their camp and kills half the people, 5 people with blue eyes, 5 people with brown eyes and 10 people with green eyes survive. This means that due to this random event the frequency of the green eye genotype are suddenly in a majority - which will likely increase in subsequent generations. This shift favoring green eyes, wa snot a result of natural selection, but of a random effect that had nothing to do with the trait itself - this is an example of genetic drift.
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