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 genotype and phenotypes are possible?

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

Answer 1

The correct option is C 4 genotypes; 3 phenotypes

Gametes	$I^A$	$I^B$
$I^A$	$I^A$$I^A$	$I^A$$I^B$
i	$I^A$i	$I^B$i

Based on the Punnett square, it is found that there are 4 genotypes
($I^A$$I^A$, $I^A$$I^B$, $I^A$i and $I^B$i)
and 3 phenotypes (blood group - A, B and AB).