How is blood type inherited?

Blood type is determined by three alleles: IA, IB, and i. IA and IB are codominant, and both are dominant over i. Each parent contributes one allele.

Can two type O parents have a non-O child?

No. Both type O parents have genotype ii, so all children will receive an i allele from each parent and will be type O.

Blood Type Inheritance Calculator

Determine the possible blood types of children based on both parents' blood types using ABO blood group genetics. Shows all possible genotype combinations and their probabilities.

Inputs

Parent 1 Blood Type

Parent 2 Blood Type

Results

Possible Types

Type A, Type B, Type AB, Type O

# Outcomes

Blood Type Probabilities

Blood Type Inheritance Results

Parameter	Value
Parent 1 Blood Type	Type A
Parent 1 Possible Genotypes	IA/IA or IA/i
Parent 2 Blood Type	Type B
Parent 2 Possible Genotypes	IB/IB or IB/i
Total Combinations	16
Type A Probability	18.8%
Type B Probability	18.8%
Type AB Probability	56.3%
Type O Probability	6.3%
Possible Offspring Types	Type A, Type B, Type AB, Type O

Last updated: April 16, 2026

Frequently Asked Questions

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