Differential Gene Expression and Chromatin Structure
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Questions and Answers

What is the phenomenon called when only one X chromosome is functioning in a mammalian somatic cell?

  • X chromosome duplication
  • X chromosome mutation
  • X chromosome inactivation (correct)
  • X chromosome activation

    • What is the structure of the inactive X chromosome during most of the cell cycle?

  • Chromoplast
  • Heterochromatin (correct)
  • Euchromatin
  • Centromere

    • What is the mechanism that converges in inactivating an X chromosome across mammalian groups?

  • Demethylation of promoters
  • Transcription of genes
  • Methylation of promoters (correct)
  • Replication of chromosomes

    • What is the name of the locus on the X chromosome that is transcribed on the inactive X chromosome?

    <p>XIST</p> Signup and view all the answers

    What happens to the promoter regions of genes on the inactive X chromosome in humans?

    <p>They are methylated</p> Signup and view all the answers

    What is the product of the XIST locus gene?

    <p>An untranslated RNA molecule</p> Signup and view all the answers

    When does the inactive X chromosome replicate in the cell cycle?

    <p>Later than most chromatin</p> Signup and view all the answers

    What is the result of X chromosome inactivation in mammalian somatic cells?

    <p>One functioning X chromosome</p> Signup and view all the answers

    What is the significance of XIST RNA coating the inactive X chromosome?

    <p>It remodels the chromatin</p> Signup and view all the answers

    Which of the following is a characteristic of the inactive X chromosome?

    <p>It is highly condensed</p> Signup and view all the answers

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