GRE question I do not get

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

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GRE question I do not get

Post by polymath » Fri Nov 07, 2008 7:21 am


I'm studying for the biology gre and there's a question I do not understand how they got the answer. Basically, there's a gene with allelic frequencies of .8 and .2 respectively for allele A and allele B. What is the probability that two heterozygous individuals will mate, given that the gene is in Hardy-Weinberg equilibrium.

The answer is .10 and I cannot get that no matter how i put those allelic frequencies into HWE. Can someone shed some light on this one? Thanks.

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Post by mith » Fri Nov 07, 2008 6:12 pm


A+B=1 then since 1^2 is also 1, (A+B)^2 also = 1.
Expand out the binomial and you get your hetero frequencies.
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