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Maternal Effect Genes in Embryonic Development
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Maternal Effect Genes in Embryonic Development

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Questions and Answers

What is the role of Torso mRNA laid down by the mother?

  • Controls the trunk region of the embryo
  • Regulates polarity after fertilization
  • Specifies terminal ends of the embryo (correct)
  • Activates Bicoid and Nanos genes

    • Which maternal effect gene is responsible for setting up the anterior-posterior (A-P) axis in Drosophila?

  • Hunchback
  • Caudal
  • Bicoid (correct)
  • Nanos

    • What happens in embryos when there is a mutation in the Nanos gene?

  • Both ends of the embryo are affected
  • The trunk region is not specified
  • Embryos lack a head region
  • Embryos lack a tail region (correct)

    • How do Bicoid and Nanos proteins influence downstream target genes?

    <p>Work together in a gradient mechanism</p> Signup and view all the answers

    Which gene specifies terminal ends by acting as a ligand for the Torso receptor tyrosine kinase?

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

    What is the outcome of embryos from homozygous mutant mothers affecting the Torso gene?

    <p>Embryos lack terminal structures</p> Signup and view all the answers

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