# A- Level Biology: Hardy-Weinberg Principle

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#1
Hardy-Weinberg Principle ????
Last edited by Afroguy; 2 years ago
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2 years ago
#2
(Original post by Afroguy)
The following genotypes are found in a population:
AA: 70 individuals
Aa: 50 individuals
aa: 20 individuals
What are the allele frequencies of A and a?

I believe p^2 = 0.5, q^2 = 1/7 and 2pq = 5/14 ( but this may be wrong!)
What is the answer and how do you work it out??!

Thanks.
So you're just trying to work out the allele frequencies from the full set of genotypes – and these were given in the question?

You don't need the p^2 + 2pq + q^2 for that.

The total number of A alleles is (70 x 2) + 50 = 190 and the total number of a alleles is (20 x 2) + 50 = 90.
Their frequencies are 190/(190+90) and 90/(190+90)
A=0.68 (to 2 decimal places)
a=0.32
2
#3
(Original post by Trumbles)
So you're just trying to work out the allele frequencies from the full set of genotypes – and these were given in the question?

You don't need the p^2 + 2pq + q^2 for that.

The total number of A alleles is (70 x 2) + 50 = 190 and the total number of a alleles is (20 x 2) + 50 = 90.
Their frequencies are 190/(190+90) and 90/(190+90)
A=0.68 (to 2 decimal places)
a=0.32
Thanks
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