The genotypes of a Husband and Wife are $I^A I^B$ and $I^{A}i$ .
Among the blood types of their children, how many different genotypes and phenotypes are possible?

• A

  3 genotypes; 3 phenotypes
• B

  3 genotypes; 4 phenotypes
• Correct answer
  C

  4 genotypes; 3 phenotypes
• D

  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 $I^{A}i=A$

$I^A I^B=AB$

$I^{B}i=B$

Hence, the correct answer is option: 'C'.