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July 02, 2025, 09:16:56 pm
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Author Topic: Genetic Drift question  (Read 2129 times)  Share 

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zool3

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Genetic Drift question
« on: September 17, 2011, 02:25:59 pm »
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can someone please explain to me what genetic drift, founder effect and founder population is?
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dou0014

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Re: Genetic Drift question
« Reply #1 on: September 17, 2011, 04:27:20 pm »
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Genetic Drift is simply a random event that does not benefit a particular species but changes the allele frequencies present in a particular population. eg. a random mutation etc. These alleles are then passed on to the next generation.

The founder effect is when a small unrepresented sample of individuals form from that of a larger population.  They splinter off to form a new population.  This new population may have limited variation but over successful generations they have a phenotype extremely different to that of the original population they came from. 
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zool3

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Re: Genetic Drift question
« Reply #2 on: September 17, 2011, 08:04:31 pm »
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what do you mean by unrepresented sample? does that mean it doesnt exist in the new population.
and the 'larger population' is the old population?

and also thanks for explaining genetic drift! :)
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Russ

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Re: Genetic Drift question
« Reply #3 on: September 17, 2011, 08:29:22 pm »
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he means that the sample that gave rise to the new population were not representative of the old population. So if the old population was 10 red and 10 white birds, if you chose 8 red and 2 white that wouldn't be a representative sample.
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zool3

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Re: Genetic Drift question
« Reply #4 on: September 17, 2011, 10:34:41 pm »
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ohhh okay!! thanks a lot guys! great help! :)
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zool3

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Re: Genetic Drift question
« Reply #5 on: September 18, 2011, 07:19:10 pm »
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ohhh another question, whats the difference between natural selection and genetic drift?
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nooshnoosh95

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Re: Genetic Drift question
« Reply #6 on: September 18, 2011, 08:14:00 pm »
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natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring
and genetic drift is the change in the frequency of an allele due to natural selection
not 100% sure but thats what i think
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xx :D

omgwtf123

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Re: Genetic Drift question
« Reply #7 on: September 18, 2011, 08:17:25 pm »
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i agree with the above post, but to be really picky, i'd say produce a larger proportion of viable offspring :)
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omgwtf123

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Re: Genetic Drift question
« Reply #8 on: September 18, 2011, 08:25:24 pm »
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oh and genetic drift is the change in allele frequency not on selection pressures but on pure chance alone. This can be due to mutations that are passed on to the next generation or meiotic "processes" such as segregation, crossing over and independant assortment of chromosones into gametes
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zool3

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Re: Genetic Drift question
« Reply #9 on: September 18, 2011, 11:12:14 pm »
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ohh you guys are champions! thanks heaps! :)
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