Question

Which blood group individual is only homozygous?

• A. A
• B. B
• C. O
• D. AB

Answer 1

The correct option is C O

Blood group A: Express itself in both heterozygous $\left(I^{A}i\right)$ and homozygous $\left(I^A{I}^A\right)$ conditions.

Blood group B: Express itself in both heterozygous $\left(I^{B}i\right)$ and homozygous $\left(I^B{I}^B\right)$ conditions.

Blood group AB: Express only in heterozygous condition $\left(I^A{I}^B\right)$.

Blood group O: Express itself only in homozygous condition $\left(ii\right)$.