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Question

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
4 genotypes; 4 phenotypes
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B
3 genotypes; 3 phenotypes
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C
3 genotypes; 4 phenotypes
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D
4 genotypes; 3 phenotypes
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Solution

The correct option is C $$4$$ genotypes; $$3$$ phenotypes
The genotype of a husband and wife are I$$^A$$I$$^B$$ and I$$^A$$I.
Four different possible genotypes of their children are:
I$$^A$$I$$^B$$, I$$^A$$I, I$$^B$$I, I$$^A$$I$$^A$$
The possible number of phenotypes of their children are:
  1. Blood group A (I$$^A$$I$$^A$$, I$$^A$$I)
  2. Blood group B (I$$^B$$I)
  3. Blood group AB (I$$^A$$I$$^B$$)
Thus, the correct answer is option D.

Biology

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