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

Question

Quizplus · Accepted Answer

This is an example of a change in a developmental gene or its regulation that altered the spatial organization of body parts, which is what Hox genes influence by determining the body plan of an organism during embryonic development.

A Genetic Change That Caused a Certain Hox Gene to Be