Dictionary » G » Genetic drift

Genetic drift

Definition

noun

The process of change in the genetic composition of a population due to chance or random events rather than by natural selection, resulting in changes in allele frequencies over time.


Supplement

The effect of genetic drift in large populations is usually negligible whereas in small populations, it predominates. In a small population, genetic drift results in some alleles become more common while others become less common over time.


Compare: natural selection


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Re:

... their environment. The tool-making traits may be eliminated simply by genetic drift. Or the tool-making traits may have certain disadvantages, such as higher energy requirements, ...

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by wildfunguy
Sat Oct 19, 2013 3:13 pm
 
Forum: Evolution
Topic: Is complexity inevitable?
Replies: 16
Views: 4647

Re:

... in each. Quite so! They do add up; and this is the basis of measuring genetic distances and inferring phylogeny. This if very effective; because ... and many will become fixed. This is the basis of "genetic drift". Another implication: the deleterious mutation rate (more than ...

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by ChrisHoStuart
Tue Oct 15, 2013 2:19 pm
 
Forum: Evolution
Topic: Beneficial mutations vs harmful
Replies: 12
Views: 3809

Questions about phenotypic plasticity

... factor would have to come into play. In a small population, random genetic drift could cause the entire population to lose phenotypic plasticity. Or, plasticity might ...

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by Luxorien
Sun Dec 23, 2012 9:08 pm
 
Forum: Evolution
Topic: Questions about phenotypic plasticity
Replies: 3
Views: 3030

Re: Is evolution as simple as we think?

... is NOT a RESPONSE system. Evolution is OUTCOME or END RESULT of genetic mutation/drift + selective pressure or absence of it (diversification process). If you put a live chicken ...

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by Rap
Sat Dec 01, 2012 1:43 am
 
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 15951

Re: Is evolution as simple as we think?

... is NOT a RESPONSE system. Evolution is OUTCOME or END RESULT of genetic mutation/drift + selective pressure or absence of it (diversification process). If you put a live chicken ...

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by Cat
Sat Dec 01, 2012 1:14 am
 
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 15951
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