The genotypes of a Husband and Wife are I A I B and I A i . Among the blood types of their children, how…

1. 3 genotypes; 3 phenotypes
2. 3 genotypes; 4 phenotypes
3. 4 genotypes; 3 phenotypes
4. 4 genotypes; 4 phenotypes

Solution

$\begin{array}{ccc}\text{Husband}& \times & \text{Wife}\\ {\text{I}}^{\text{A}}{\text{I}}^{\text{B}}& & {\text{I}}^{\text{A}}\text{i}\end{array}$

Number of genotypes = 4
Number of phenotypes = 3
$I^A I^A$ and $I^{A}i=A$
$I^A I^B=AB$
$I^{B}i=B$

Asked in: NEET 2017

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