A Genetic Change That Caused a Certain Hox Gene to Be

question 6

Multiple Choice

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) paedomorphosis.
• C) a change in a developmental gene or in its regulation that altered the spatial organization of body parts.
• D) heterochrony.
• E) gene duplication.

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