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A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped make possible the evolution of the tetrapod limb. This type of change is illustrative of:.a. the influence of environment on development. b. heterochrony. c. a change in a developmental gene or its regulation that altered the spatial organization of body parts. d. gene duplication.
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A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb b...
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