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You should use a Punnett Square. Type O is recessive and the genotype is OO. Type A can either be AO or AA.
AA x OO:
If the father possesses an AA genotype, the offspring has a 100% chance of being blood type A.
AO x OO:
If the father possesses an AO genotype, the offspring has a 50% of being blood type A and a 50% chance of being blood type O.
In matings between Rh-positive and Rh-negative individuals, two parents have been observed among the off-springs. If the Rh-positive parent is homozygous (RR), then all the children will be Rh-positive, even though they are heterozygous (Rr). If, however, Rh-positive parent is heterozygous (Rr), then one half of the offspring are expected to be Rh-positive (Rr) and the other half Rh negative (rr).
The possible genotypes of the mother will be OO and OO and the possible genotypes of the father will be AA and AO. The mother is homozygous because she consists of same alleles of type A. The father may be heterozygous with one allele of type A and one allele of type O or may be homozygous with two alleles of type O. The possible blood types of the offspring will be A or O, if the father is heterozygous or will be A, if the father is homozygous.
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