Question

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

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

Answer 1

The correct option is B 4 genotypes; 3 phenotypes

An organism's genotype is the set of genes that it carries. An organism's phenotype is all of its observable characteristics.
The genotypes of a husband and wife are $I^A$$I^B$ and $I^{A}i$ so the possible genotypes are $I^{A}i,I^{B}i,I^A{I}^A,I^A{I}^B$The phenotypes of these genotypes are - blood group A, blood group B and blood group AB.