Question 2

Since the mother can only provide alleles for O type blood (i), the father must provide the allele for blood type A (I^A). Three genotypes can provide the I^A allele: I^A I^A (blood type A), I^A i (blood type A), or I^A I^B (blood type AB). So the father must be either blood type A or blood type AB. The child (with blood type A) must be heterozygous, I^A i (remember the O allele, i, is recessive to both the A and the B alleles).