If the father is heterozygous, there is a 50% probability for a blood type A child and a 50% probability for a blood type O child.
If the father is homozygous, every offspring will be blood type A. The mother of the child is Rh+. She may be homozygous or she may be heterozygous with one Rh+ allele and one Rh- allele.
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Explanation:
If the father is heterozygous, there is a 50% probability for a blood type A child and a 50% probability for a blood type O child.
If the father is homozygous, every offspring will be blood type A. The mother of the child is Rh+. She may be homozygous or she may be heterozygous with one Rh+ allele and one Rh- allele.