BotanyA man with blood group ‘A’  marries a woman with blood group ‘B’.  What are all the  possible blood  groups of their offspring?

A man with blood group 'A'  marries a woman with blood group 'B'.  What are all the  possible blood  groups of their offspring?

  1. A

    A, B, AB and O

  2. B

    O only

  3. C

    A and B only

  4. D

    A, B and AB only

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    Solution:

    A man with blood group A marries a woman with blood group B. 

    The genotype of the man may be IAIAor IAi 

    The genotype of the woman can be IBIBor IBi 

    If the man has genotype IAIA and woman has genotype IBIB then all the offspring produced will have genotype of IAIB. But we no such options. 

    Therefore, we will assume that the genotype of man is IAi and the genotype of woman is IBi.

    IAi X IBi.

    Gametes of man is: IA and i

    Gametes of woman is: IB and i

    The genotypes of the offspring are IAIBIAiIBi and ii

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