Blood Type Heredity Chart

Parent Blood Types Possible Child Blood Types Impossible Child Blood Types
O + O O A , B , AB
O + A A , O B , AB
O + B B , O A , AB
O + AB A , B O , AB
A + A A , O AB , B
A + B AB , A , B , O
A + AB A , B , AB O
B + B B , O A , AB
B + AB A , B , AB O
AB + AB A , B , AB O

Blood type inheritance follows Mendelian genetics. The ABO blood type system is controlled by three alleles: A, B, and O.

This tool calculates possible blood types of children based on parents' blood types. Results are for reference only; actual blood types should be confirmed through medical testing.