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Problem

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question

The geneticist Mary Lyon hypothesized the existence of structures visible just under the nuclear membrane in mammals, which were later named Barr bodies. Which of the following statement is NOT correct about Barr bodies?

category

biology

options

  1. In the early female embryo, one copy of the X chromosome becomes inactivated in every body cell.
  2. The same chromosome in every cell of a normal female is inactivated.
  3. A male with the XXY genotype will have one Barr body.
  4. Barr bodies consist of highly methylated DNA.

src

ori_mmlu-high_school_biology

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