## hardy weinburg equation

Genetics as it applies to evolution, molecular biology, and medical aspects.

jbd02
Garter
Posts: 2
Joined: Fri Nov 18, 2005 6:48 pm

### hardy weinburg equation

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?

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
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
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

jbd02
Garter
Posts: 2
Joined: Fri Nov 18, 2005 6:48 pm
thank you soooo much!! i was sooo lost, i had 3 possible answers and that was one option! thank you so much!!

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
You are most welcome. I understand you very well, since i nevr liked this principle(and there isn't practically any use to it...)
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

sdekivit
King Cobra
Posts: 586
Joined: Sat Jul 30, 2005 7:16 pm
Location: holland
Contact:
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.

victor
King Cobra
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..
Contact:
Thats for two alleles. How about three alleles? p + q + r = 1
Q: Why are chemists great for solving problems?
A: They have all the solutions.

sdekivit
King Cobra
Posts: 586
Joined: Sat Jul 30, 2005 7:16 pm
Location: holland
Contact:
victor wrote:Thats for two alleles. How about three alleles? p + q + r = 1

yes, but then it will get more complicated

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
It gets interesting
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

victor
King Cobra
Posts: 2668
Joined: Sat Apr 30, 2005 12:01 pm
Location: Yogyakarta, Indonesia..
Contact:
and confusing....I learned the three alleles one, and still can't understand them all....
Q: Why are chemists great for solving problems?
A: They have all the solutions.

MrMistery
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:
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...
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Terry K.