ABO blood type crosses
http://www2s.biglobe.ne.jp/~hiroshin/blood_type/heredity_e.html
phenotype genotype
parents child parents child
OxO O OOxOO OO
OxA O, A OOxAO

OOxAA

OO, AO

AO

AxA O, A AOxAO

AOxAA

AAxAA

OO, AO, AA

AO, AA

AA

OxB O, B OOxBO

OOxBB

OO, BO

BO

BxB O, B BOxBO

BOxBB

BBxBB

OO, BO, BB

BO, BB

BB

OxAB A, B OOxAB AO, BO
AxAB A, B, AB AOxAB

AAxAB

AO, AA, BO, AB

AA, AB

BxAB A, B, AB BOxAB

BBxAB

AO, BO, BB, AB

BB, AB

ABxAB A, B, AB ABxAB AA, BB, AB
AxB O, A, B, AB AOxBO

AOxBB

AAxBO

AAxBB

OO, AO, BO, AB

BO, AB

AO, AB

AB