hardy weinburg equation

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jbd02
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hardy weinburg equation

Post by jbd02 » Fri Nov 18, 2005 6:54 pm

PLEASE HELP ASAP!!!!

Hardy Weinburg Equation....

A particular phenotype is caused by homozygous recessive alleles. In a population, the recessive phenotype is seen 1 in 400 individuals. If there are only 2 alleles. What is the allele frequency of the recessive allele?

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MrMistery
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Post by MrMistery » Fri Nov 18, 2005 7:34 pm

oh, it's been a while since i did my last hardy weinberg equation...
so if the frequency of the recessive allele is p and the frequency of the phenotype is p^2=0,25% then p=0.05
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Post by jbd02 » Sun Nov 20, 2005 2:23 am

thank you soooo much!! i was sooo lost, i had 3 possible answers and that was one option! thank you so much!! :D

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MrMistery
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Post by MrMistery » Sun Nov 20, 2005 3:41 pm

You are most welcome. I understand you very well, since i nevr liked this principle(and there isn't practically any use to it...)
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Post by sdekivit » Sun Nov 20, 2005 9:16 pm

p + q = 1 and if we take A for dominant and a for recessive then AA = p^2, Aa = 2 * p * q and aa = q^2

These are the golden rules in Hardy-Weinberg.

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Post by victor » Mon Nov 21, 2005 12:33 pm

Thats for two alleles. How about three alleles? p + q + r = 1
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Post by sdekivit » Wed Nov 23, 2005 8:57 pm

victor wrote:Thats for two alleles. How about three alleles? p + q + r = 1


yes, but then it will get more complicated :twisted:

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MrMistery
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Post by MrMistery » Thu Nov 24, 2005 6:34 pm

It gets interesting :)
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Post by victor » Fri Nov 25, 2005 1:47 pm

and confusing....I learned the three alleles one, and still can't understand them all....
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Post by MrMistery » Fri Nov 25, 2005 9:43 pm

hw is basically math, not biology... These "fundamental" things in population genetics are generally all math, not bio. Then, when you study gene flow and the rate of mutation it gets really cool. Unfortunately population genetics experiments generally take a lot of people to get involved, and sometimes expensive equipment too...
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Post by Terry K. » Tue Nov 29, 2005 11:08 pm

MrMistery wrote:You are most welcome. I understand you very well, since i nevr liked this principle(and there isn't practically any use to it...)
I have to go along with this statement because when you look at it, it's basically only about 6th grade mathematics and nothing close to biology unless you want to get technical and say the phrasing is biology related, but other than that, I really don't think it applies to anything short of 6th grade math.
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