Body Fluids and Circulation Question 10
10. ABO blood groups in humans are controlled by the gene I. It has three alleles $-I^{A} I^{B}$ and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
(a) Three
(b) One
(c) Four
(d) Two
Show Answer
Answer : c
Hints & Solutions
(c) The three alleles in ABO blood groups in humans can produce six different genotypes and four different phenotypes.
| Genotypes | Phenotypes |
|---|---|
| $I^{A}, I^{A}, I^{A} i$ | Blood group $A$ |
| $I^{B} I^{B}, I^{B} i$ | Blood group $B$ |
| $I^{A} I^{B}$ | Blood group $AB$ |
| $i i$ | Blood group $O$ |
