### Principles of Inheritance and Variation Question 21

#### 21. A man with blood group ’ $A$ ’ marries a woman with blood group ’ $B$ ‘. What are all the possible blood groups of their offsprings?

[2015 RS]

(a) A,B and AB only

(b) $A, B, AB$ and $O$

(c) O only

(d) A and B only

## Show Answer

#### Answer : b

#### Hints & Solution

(b) Possible $\quad$ $\times$ $\quad$ Possible

genotype $\qquad\qquad$ genotype

of man with blood $\quad\quad$ of woman with

group $A \qquad\qquad$ blood group $B$

$I^{A} I^{A}, I^{A} i \quad \times \quad I^{B} I^{B}, I^{B} i$

If the genotype is

$I^{A} i \qquad\qquad \times \quad I^{B} i$

The possibility of resultant blood group may be $A, B, AB$ and $O$.