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sinnopal sinnopal
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6 years ago
By transferring neural crest cells from a duck to a quail and vice versa, Schneider and Helms demonstrated that:
 
  a. neural crest cells influence the development of beaks.
  b. beaks influence fitness traits.
  c. homeobox genes are conserved across species.
  d. gene duplication causes a difference in beak shape.
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