During a University of Nevada, Reno blood donation campaign, the
frequencies of alleles determining the ABO blood groups were 0.70
for i, 0.2 for IA and 0.1 for IB. Assuming random mating, what is
the expected frequency of blood type B?
Homework Answers
Allele frequency of i (r)= 0.7
Allele frequency of IA (p) = 0.2
Allele frequency of IB (q)= 0.1
Blood type B genotypes are either IBIB or IBIi
Frequency of IBIB = q2 = 0.1*0.1= 0.01
Frequency of IBIi = 2qr = 2*0.1*0.7= 0.14
Thus expected frequency of blood type B is 0.15
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