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) Only one of the clusters is silent since it would result in Drosophila development not vertebrate.
B) Only two of the clusters are active and represent the added complexity of vertebrate development.
C) Three of the four clusters are silent and have no effect on development.
D) All four clusters are active and represent the added complexity of vertebrate development.
Answer: D
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Plant and animal development share a number of features, but differ in major ways as well. Which of the following best summarizes the similarities between the two forms of development?
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