A man has a second blood group, a woman has a third. What blood groups are possible in children from

A man has a second blood group, a woman has a third. What blood groups are possible in children from this marriage, if it is known that the man’s mother and the woman’s father were with the first group?

If a man has a second blood group, and his father has a first blood group, then the genotype of this man will be I (A) I (0). If a woman has a third blood group, and her father has a first blood group, then the genotype of this woman will be I (B) I (0). According to the genetic rules of inheritance of blood groups, these parents may have children with genotypes I (0) I (0), I (A) I (0), I (B) I (0), I (A) I (B). Therefore, children can inherit any of the blood groups in equal probability.