SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    Barr body in mammals represents

    A)  All the heterochromatin in female cells

    B)  Y- chromosomes in somatic cells of male

    C)  All heterochromatin in male and female cells

    D)  One of the two X - chromosomes in somatic cells of females

    Correct Answer: D

    Solution :

    [d] Sex chromatin body was discovered by the Canadian geneticists Murray L, Barr and E G Bertram (1949). Barr body is a highly condensed structure lies against the nuclear membrane of the inter phase cells of females. According to the British geneticist Mary Lyon (1961), one of the two X-chromosomes of a normal female becomes heterochromatic and appears as Barr body.

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