Over the Course of Evolution,humans Have Obtained Four Hox Gene

Multiple Choice

Over the course of evolution,humans have obtained four Hox gene clusters due to duplication.The presence of multiple Hox gene clusters suggests what?

A) All four clusters are active and represent the added complexity of vertebrate development.
B) Three of the four clusters are silent and have no effect on development.
C) Only two of the clusters are active and represent the added complexity of vertebrate development.
D) Only one of the clusters is silent since it would result in Drosophila development not vertebrate.