Echinodermata Classes Quiz
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Questions and Answers

What do cranial placodes give rise to in vertebrates?

  • Digestive organs
  • Respiratory system
  • Sensory ganglia (correct)
  • Dorsal fin

    • How many copies of Hox genes do living gnathostomes (including humans) have?

  • 4 (correct)
  • 3
  • 2
  • 1

    • What are transitional forms in terms of evolution?

  • Organisms that show traits from both an ancestral and a descendant group (correct)
  • Fossils showing traits only from one group
  • Species that never evolved
  • Extinct species

    • What is Haikuoella considered to be among chordates?

    <p>The earliest craniatelike chordate</p> Signup and view all the answers

    What features did Haikuoella possess?

    <p>Anterior brain and eyes</p> Signup and view all the answers

    How many additional copies of genes controlling the body plan do living gnathostomes have compared to lancelets?

    <p>4</p> Signup and view all the answers

    In what time frame were Hox genes thought to have duplicated?

    <p>Around the time of the origin of vertebrates</p> Signup and view all the answers

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