First slide

Inheritance of One Gene

Question

A man having blood group O marries a woman having blood group A. What are the probable phenotypes of the offspring?

Easy

A

A only
B

O only
C

A or O
D

A, B or O

Solution

The genotype of the man is ii
The genotype of the woman can be $I^{A} I^{A}$ or $I^{A} i$
If the genotype of the woman is $I^{A} I^{A}$ , then
$I^{A} I^{A}$ x ii
All offspring would have genotype $I^{A} i$ . Therefore, all offspring would have blood group A.
If the genotype of the woman is $I^{A} i$ , then
$I^{A} i$ x ii
Offspring would have genotype $I^{A} i$ or ii.
Therefore, the blood group of the offspring would be either A or O.

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