Question

How many phenotypes and genotypes are possible for ABO blood groups?

	Phenotypes	Genotypes
A	4	4
B	6	4
C	4	7
D	4	6

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (D)

Blood Group(Phenotype)	Antigens on RBCs	Antibodies in Plasma	Gene Combination (Genotype)
A	A	anti - B	$I^A{I}^A;I^A{I}^i$
B	B	anti-A	$I^B{I}^B;I^B{I}^i$
AB	A, B	Nil	$I^A{I}^B$
O	Nil	anti - A, B	$I^i{I}^i$