Principles of Inheritance and Variation Question 10
10. 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; 4 phenotypes
(b) 4 genotypes; 3 phenotypes
(c) 4 genotypes; 4 phenotypes
(d) 3 genotypes; 3 phenotypes
Show Answer
Answer : b
Hints & Solution
(b) Husband $\times$ Wife $I^{A} I^{B}$
| $\sigma^{2}$ | $I^{A}$ | $I^{B}$ |
|---|---|---|
| $I^{A}$ | $I^{A} I^{A}$ | $I^{A} I^{B}$ |
| $i$ | $I^{A} i$ | $I^{B} i$ |
| Number of genotypes $=4$ | ||
| Number of phenotypes $=3$ | ||
| $I^{A} I^{A}$ and $I^{A} i=A$ | ||
| $I^{A} I^{B}=AB$ | ||
| $I^{B_i}=B$ |
