Question

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. $4$ genotypes; $4$ phenotypes
• B. $3$ genotypes; $3$ phenotypes
• C. $3$ genotypes; $4$ phenotypes
• D. $4$ genotypes; $3$ phenotypes

Answer 1

Answer: (D)

$4$ genotypes; $3$ phenotypes

The genotype of a husband and wife are I${}^A$I${}^B$ and I${}^A$I.

Four different possible genotypes of their children are:

I${}^A$I${}^B$,I${}^A$I, I${}^B$I, I${}^A$I${}^A$

The possible number of phenotypes of their children are:

1. Blood group A (I${}^A$I${}^A$, I${}^A$I)
2. Blood group B (I${}^B$I)
3. Blood group AB (I${}^A$I${}^B$)

Thus, the correct answer is option D.