Can someone explain these two?

[doc3232]

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1.. .Population must be isolated from other populations to prevent gene flow.

AND

2.. .Large population to prevent genetic drift.
They seem like the same thing, genetic drift and gene flow, Basically is it to stop a change in allele frequency?


Thanks

 

[futuredent22]

Nah, they aren't the same thing.

Gene flow is the change in allele frequency due to migration. It works to decrease genetic variation between two groups and works against speciation.

Genetic drift is when you have a small population and the allele frequency in the next generation changes just by chance. for example, in a population of 5 green and 5 yellow, by chance the yellow reproduce more than the green, so the next generation is going to have lots more yellow than green.

 

[topdent1]

1.Population must be isolated from other populations to prevent gene flow.

AND

2.Large population to prevent genetic drift.
They seem like the same thing, genetic drift and gene flow, Basically is it to stop a change in allele frequency?


Thanks

Not quite.

Gene flow deals with movement of genes, across any two populations

Genetic drift occurs only during a genetic bottleneck/founder effect. The genetic drift is when a small part of the population is cut of from the main population. This small population doesn't represent the variation in genes of the entire population.

 

[doc3232]

Thanks guys, now I get it.
Does that mean .genetic drift occurs when the next generation does not properly represent the population (of the previous generation)?
.

 

[topdent1]

Thanks guys, now I get it.
Does that mean .genetic drift occurs when the next generation does not properly represent the population (of the previous generation)?
.

Yes, the process where the small population becomes separate of the whole population is called genetic drift.