What is a "Barr body"?

Options :
  1. heterochromatic chromosome 12
  2. heterochromatic chromosome found in a germ cell
  3. euchromatic chromosome 12
  4. inactive X chromosome found in a female somatic cell
Answer and Explanation :-

Answer: Option 4

Explanation:

Barr body is an inactive X-chromosome found in a female somatic cell. The phenomenon of X inactivation or "dosage compensation" was originally described by Mary Lyon and is also known as lyonization or Lyon law.

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