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WBCS Preliminary Examination 2017 — General Studies · Question 128 of 200

Q128
General ScienceBiology
Barr body is absent in somatic cells of
  1. a.Klinefelter syndrome individual
  2. b.Triple X syndrome individual
  3. c.Turner syndrome individual
  4. d.Sub-human mammalian female individual

Answer: (C) Turner syndrome individual

A Barr body forms from an inactivated "extra" X chromosome, which requires at least two X chromosomes to be present. Individuals with Turner syndrome (45,X karyotype) have only a single X chromosome, so there is no extra X to inactivate, and hence no Barr body.

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Barr body is absent in somatic cells of — WBCS Preliminary Examination 2017 Q128 | Prostuti360°