4.Principles of Inheritance and Variation
medium

The genotypes of a husband and wife are $I^AI^B$ and $I^Ai$. 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

(NEET-2017)

Solution

(b): If the genotypes of husband and wife are $I^AI^B$ and $I^Ai$ respectively, then the probabilities of genotypes and phenotypes among their children can be worked out as:

Genotype: $I^A I^A$ $ I^Ai$ $ I^AI^B$ $I^Bi$
Phenotype: $A$ $A$ $AB$ $B$

Thus, there are four possible genotypes, viz., $I^AI^A, I^Ai, I^AI^B$ and $I^Bi$ and three possible phenotypes, viz., $A, AB$ and $B$ among the children.

Standard 12
Biology

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