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NEET Biology Principle Of Inheritance And Variation Question Bank Critical Thinking

  • question_answer
    In man sometime during gametogenesis sex chromosomes are not separated themselves on account of which chromosome number becomes 45, 47 or 48. In this condition which of the following genotype and phenotype is correct

    A) 22 pairs + XXY males

    B) 22 pairs + XX females

    C) 22 pairs + XXXY females

    D) 22 + Y females

    Correct Answer: A

    Solution :

    22 pairs + XXY genotype is the result of fertilization of an ovum containing 22 + XX chromosomes which may be formed as a result of non-disjunction of X chromosome during oogenesis.


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