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NEET Biology Biotechnology And Its Applications Question Bank Genetic Variation

  • question_answer
    The number of chromosomes in Down's syndrome is [CPMT 1983; CBSE PMT 2005; AFMC 2005; MP PMT 2005]

    A) 23rd pair with one less = 45

    B) 21st pair with one more = 47

    C) 17th pair with one more = 47

    D) One extra sex chromosome = 47

    Correct Answer: B

    Solution :

    The individuals with this syndrome are trisomic for chromosome 21. Chromosomal complement is 46 + additional chromosome 21 = 47.


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