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    science
    Grade-11
    Easy

    Question

    In Down’s syndrome of a male child, the sex chromosome is

    1. XO
    2. XY
    3. XX
    4. XXY

    Hint:

    23rd chromosome is the sex chromosome.

    The correct answer is: XY

      Down syndrome is a genetic disorder. It is a chromosomal disorder caused due to the presence of an extra copy of a chromosome (trisomy). The individual affected by Down syndrome will have XXY as its 21st chromosome. The condition affects the somatic chromosome alone.
      Sex chromosome of a male is XY and is chromosome 23. It will not be altered.

      • Down syndrome is a genetic disorder 
      • It is a trisomy condition having extra copy of chromosome 21
      • The individual affected will have disability associated with nervous system
      • Sex chromosome remains unaffected irrespective of the disorder

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