Heterochrony and Skeletal Structures
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Heterochrony and Skeletal Structures

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Questions and Answers

Which genes control the spatial organization of body parts?

  • Homeotic genes (correct)
  • Hox genes
  • Master regulatory genes
  • Developmental genes

    • What is the role of Hox genes in animal development?

  • Control spatial organization
  • Determine body form
  • Facilitate gene duplication
  • Provide positional information (correct)

    • How did six-legged insects likely evolve from a many-legged crustacean ancestor?

  • Changes in the Hox gene Ubx (correct)
  • Regulatory changes in developmental genes
  • Changes in gene sequence
  • Gene duplication events

    • What is the likely role of new developmental genes arising from gene duplication events?

    <p>Facilitate the origin of novel morphological forms</p> Signup and view all the answers

    What causes the loss of spines in lake stickleback fish?

    <p>Differences in gene regulation compared to marine sticklebacks</p> Signup and view all the answers

    What can regulatory changes in developmental genes be limited to?

    <p>Individual cell types</p> Signup and view all the answers

    What is the likely role of changes in the regulation of developmental genes in the evolution of body form?

    <p>Important role</p> Signup and view all the answers

    What are homeotic genes?

    <p>Master regulatory genes</p> Signup and view all the answers

    What is the likely role of Hox genes in the evolution of body form?

    <p>Determine body form</p> Signup and view all the answers

    What is the likely role of changes in gene sequence in the evolution of body form?

    <p>Limited role</p> Signup and view all the answers

    Which of the following is an example of heterochrony mentioned in the text?

    <p>Changes in the skeletal structure of bat wings</p> Signup and view all the answers

    What does paedomorphosis refer to?

    <p>The retention of juvenile structures in sexually mature species</p> Signup and view all the answers

    In paedomorphosis, how does the rate of reproductive development compare to somatic development?

    <p>It accelerates</p> Signup and view all the answers

    What can heterochrony alter in terms of reproductive development?

    <p>The timing of reproductive development</p> Signup and view all the answers

    Which of the following is not an example of heterochrony?

    <p>Changes in the relative skull growth rates</p> Signup and view all the answers

    What is the result of increased growth rates of finger bones in bat wings?

    <p>Changes in the skeletal structure</p> Signup and view all the answers

    What is the main focus of the text?

    <p>Changes in the skeletal structure of bat wings</p> Signup and view all the answers

    What does heterochrony refer to in the context of the text?

    <p>Changes in the reproductive development of nonreproductive organs</p> Signup and view all the answers

    What is the result of paedomorphosis?

    <p>Retention of juvenile structures in sexually mature species</p> Signup and view all the answers

    What is the term used to describe the elongated hand and finger bones in a bat wing?

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

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