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Home Q & A Board Biology-Related Homework Help General Biology
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hongocbaotram hongocbaotram
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6 years ago
Hagfish, lampreys, gnathostomes, mammals, birds, fish, reptiles, and amphibians are all vertebrates and are sometimes referred to as the subphylum Craniata: animals with a cranium. Amphioxus and ascidians are not in Craniata.
 
  How does mapping characters associated with the neural crest assist us in understanding the evolution of complex traits?
 
  What will be an ideal response?
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6 years ago
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The neural crest is directly associated with the evolution of a cranium. Given that the neural crest is involved in many head characters, this suggests that novel neural crest cells may be responsible for the evolution of a major complex trait in chordates. The similar, yet different, cells found in related species suggests that the neural crests cells evolved from those other cells.
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