How is ABO blood type inherited?

ABO blood type is determined by A, B, and O alleles. A and B are dominant, O is recessive. Each parent contributes one allele, forming the child's blood type.

How is Rh factor inherited?

Rh factor is determined by D antigen. Rh+ is dominant, Rh- is recessive. At least one Rh+ parent means child could be Rh+; only two Rh- parents guarantee Rh- child.

Are there exceptions?

This calculator uses classical genetics. Rh- mothers with Rh+ fetuses may need medical attention. Rare genetic variants can produce different results.

Blood Type Inheritance Calculator - ABO & Rh

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Predict child blood types from parents

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Father ABO Type

Father Rh Factor

Mother ABO Type

Mother Rh Factor

Possible Child Blood Types

💡 ABO: A and B dominant, O recessive. Rh+ dominant, Rh- recessive.

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Possible Child Blood Types

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