Blood Type Inheritance: Mother Type B, Father Type O – Child's Possible Blood Types

Genetic Basis

• ABO gene (chromosome 9): 3 alleles – Iᴬ, Iᴮ, i (O).
• Iᴬ and Iᴮ are codominant; i is recessive.

Parental Genotypes

• Mother Type B: IᴮIᴮ or Iᴮi.
• Father Type O: ii (only possible genotype).

Possible Child Genotypes & Phenotypes

Mother Genotype	Father Genotype	Possible Child Genotypes	Child Phenotypes
IᴮIᴮ	ii	All Iᴮi	100% Type B
Iᴮi	ii	50% Iᴮi, 50% ii	50% Type B, 50% Type O

Conclusion

Possible blood types: B or O. Type A and AB are impossible with these parents.

Rh Factor Note

Rh inheritance is independent. If both parents Rh+, child can be Rh+ or Rh- (if both heterozygous). If mother Rh-, father Rh+, child could be Rh+ (sensitization risk).