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

  • question_answer
    Karyotype of Down's syndrome has how many chromosomes?

    A) 43                    

    B) 46     

    C) 47        

    D) 45

    Correct Answer: C

    Solution :

    [c] Karyotype of people suffering from Down's syndrome have 47 chromosomes ( 45 + XY in males, 45 + XX in females) instead of 46. It is caused due to the presence of an extra chromosome, i.e. chromosome number 21. Thus, it is also known as 21 trisomy.


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