Final answer:
Hox genes are highly conserved genes that determine the body plan and development of animals. The Antennapedia gene is one of the earliest Hox genes to evolve and has given rise to other Hox gene family members through gene duplication. The correct answer is A. Antennapedia.
Step-by-step explanation:
The subject of this question is Biology. Hox genes are a group of highly conserved genes that encode transcription factors responsible for determining the general body plan and development of animals. They contain DNA sequences called homeoboxes and serve as "master control genes" that regulate the expression of other genes. One of the very first Hox genes to evolve is the Antennapedia gene, which has given rise to many other members of the Hox gene family through gene duplication. The correct answer is A. Antennapedia.