Parents have 2 (A) and 3 (B) blood groups. there is one child in the family with the first blood group.

Parents have 2 (A) and 3 (B) blood groups. there is one child in the family with the first blood group. what blood types can children have from this marriage

If the family has a child with the first blood group, then both parents in the genotype necessarily have a recessive gene I (0). This means that parents with the second and third blood groups have genotypes I (A) I (0) and I (B) I (0). According to the genetic rules for inheriting blood groups, their children will have genotypes I (0) I (0), I (A) I (0), I (B) I (0), I (A) I (B). Thus, from this marriage there can be children with any of the four blood groups in equal probability.