X-Chromosomes Inactivation Occurs in Female XX Animals MCQ

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• In which stage of the cell cycle the Barr body can be identified?
  ক

  Interphase

  খ

  Prophase

  গ

  Metaphase

  ঘ

  Anaphase
• The one which is able to repress the production of the Xist transcript is the active X chromosome.
  ক

  True

  খ

  False
• The functional product of the Xist gene is ___________
  ক

  mRNA

  খ

  rRNA

  গ

  RNA devoid of ORF

  ঘ

  Protein
• All genes on the inactivated X chromosome are transcriptionally silent.
  ক

  True

  খ

  False
• The X-chromosome once inactivated remains inactive throughout the life in all the cells of the body.
  ক

  True

  খ

  False
• What changes occur in the chromosome to make it inactive?
  ক

  Methylation

  খ

  Glycosylation

  গ

  Acetylation

  ঘ

  Phosphorylation
• Barr body is the ___________
  ক

  Active X chromosome

  খ

  Inactive X chromosome

  গ

  Active Y chromosome

  ঘ

  Inactive Y chromosome
• The best genetic mosaicism is observed in which of the following?
  ক

  Tobacco

  খ

  Fruitfly

  গ

  Dragonfly

  ঘ

  Cat
• Female mammals are called genetic mosaics.
  ক

  True

  খ

  False
• The maternal X-chromosome is inactivated during Dosage compensation.
  ক

  True

  খ

  False
• The proposal for the concept of X-chromosome inactivation in female XX-chromosomes was experimentally shown in ___________
  ক

  Drosophila

  খ

  Mice

  গ

  Human

  ঘ

  Monkey
• X-chromosome inactivation is known as ______________
  ক

  Dominance

  খ

  Epistasis

  গ

  Dosage compensation

  ঘ

  Complementation