Blood Type Knowledge

In medicine, blood types are generally divided into six types: AA, OA, BB, OB, AB and O. AA type and OA type are collectively called A type, and BB type and OB type are also collectively called B type.

The blood type of a child is a new blood type formed by combining a part of the father's blood type (A, B or O) and a part of the mother's blood type (A, B or O). This new blood type is the blood type of the child, so the blood type of the child is related to the blood types of the parents.

The table of the matching relationship between children's blood types and parents' blood types

Parents' Blood Types	Children's Possible Blood Types	Children's Impossible Blood Types
A × A	A, O	B, AB
A × B	A, B, AB, O	-
A × AB	A, B, AB	O
A × O	A, O	B, AB
B × B	B, O	A, AB
B × AB	A, B, AB	O
B × O	B, O	A, AB
AB × AB	A, B, AB	O
AB × O	A, B	AB, O
O × O	O	A, B, AB