Based on the information from the search results, the mother has blood type AB and the father has blood type A. To determine the possible blood types of their offspring, we need to consider the ABO blood type inheritance pattern. Each person carries two ABO alleles, one from each parent. The possible ABO alleles are A, B, and O. The A and B alleles are codominant, while the O allele is recessive. Therefore, a person with blood type AB has one A allele and one B allele. A person with blood type A has either two A alleles or one A allele and one O allele.
Using this information, we can create a Punnett square to determine the possible blood types of their offspring. The Punnett square shows that their offspring could have blood types A or AB, with equal probability. Therefore, if a mother has blood type AB and the father has blood type A, their offspring could have blood types A or AB.
