Blood Group Inheritance
Blood groups are inherited from both parents.
Nature of blood group;
A, B, AB, O
3 alleles; types of alleles
Alleles; variation form of gene which are located at same position or genetic locus on chromosomes.
(I); lA=A (dominant) , lB= B( dominant), IO; O (recessive)
IA=IB (equally dominant)
IA IB = AB
lA=lB > lO
Blood Group
ABO system (ABO genes)/ Blood group system
Group A Group B Group AB Group O
RBC type A B AB O
Antibiotics in anti-B anti-A None anti-A anti-B
Plasma
Antigen in A antigen B antigen A & B antigen None
RBC
Recieve OA OB O, A, B, AB O
Donate. A, AB B, AB AB O, A, B, AB
Blood group phenotype
A= IA lA, IA IO
B= lB lB, lB IO
AB= lA lB
O= lOlO
ABO Inheritance
Alleles from Alleles from Child Child's
Parent 1 Parent 2 Genotype Phenotype
1. A A AA A
2. A O AO A
3. A B AB AB
4. B B BB B
5. B O BO B
6. O O OO O
Example, if O gene is paired with A gene, blood type will be A.
Rhesus blood group system
Rh factor;
1. Rh positive
2. Rh negative
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