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12th Class Biology Principle Of Inheritance And Variation Question Bank MCQs - Principles of Inheritance and Variation

  • question_answer
    A mother in a family of five daughters is expecting her sixth baby. The chance of this being a son is

    A) 0%                               

    B) 25%

    C) 50%                 

    D) 100%

    Correct Answer: C

    Solution :

    [c] Human has 22 pairs of autosomes and 1 pair of sex chromosome which are XX in females and XY in males. So, every time, the chance of son or daughter is 50% depending upon which sex chromosome from male fertilises the ovum.


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