A) during fertilisation
B) early in the gestational development
C) immediately before birth
D) prior to the con set of puberty
Correct Answer: B
Solution :
In homogametic XX female individuals, one X-chromosome gets characteristically condensed and inactivated. Such chromatin material is called facultative heterochromatin. Since, it becomes inactive in certain part of the life cycle and resumes activity before entering the germ line. This heterochromatinised in active chromatin body is called sex chromatin or Barr body.
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