The (fabricated) dataset in Table 1 summarizes information gathered about the number of individuals from different blood groups on the Easter Islands. Some of the information is missing.

a)Fill in the missing parts of the table. Show your work.

b) If the alleles are combined into genotypes at random, what is the probability of ending up with a AB genotype (Hint: Pr(AB) = Pr(AB or BA)). Derive your answer first for the general case (i.e. using pA and pB to represent the allele frequencies). Then substitute in your values of the allele frequencies from part a) to calculate the answer for this specific case.

Table 1: Data on blood group genotypes for a sample of Easter Island adults

Genotype Number Genotype Frequency

AA 232 ?

AB98 ?

BB 29 ?

AO 96 ?

BO176?

OO19 ?