A Genetic Change That Caused a Certain Hox Gene to Be

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