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 (D)</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 (C)</p> Signup and view all the answers

What can regulatory changes in developmental genes be limited to?

<p>Individual cell types (D)</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 (A)</p> Signup and view all the answers

What are homeotic genes?

<p>Master regulatory genes (A)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

What does paedomorphosis refer to?

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

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

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

What can heterochrony alter in terms of reproductive development?

<p>The timing of reproductive development (B)</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 (D)</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 (D)</p> Signup and view all the answers

What is the main focus of the text?

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

What is the result of paedomorphosis?

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