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

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

  1. A

    A only

  2. B

    O only

  3. C

    A or O 

  4. D

    A, B or O

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    Solution:

    The genotype of the man is ii

    The genotype of the woman can be IAIA or IAi

    If the genotype of the woman is IAIA, then

    IAIAx ii

    All offspring would have genotype IAi. Therefore, all offspring would have blood group A.

    If the genotype of the woman is IAi, then

    IAix ii

    Offspring would have genotype IAior ii.

    Therefore, the blood group of the offspring would be either A or O.

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