Question

in vertebrates such as a chicken, a mouse, or a python, variation in the number of vertebrae in the spine is determined by hox genes. hox genes in the development of body plans in animals chick head hox c8 cervical thoracic lumbar mouse head hox c8 cervical thoracic lumbar python hox c8 head thoracic which is the most likely way that hox genes account for these variations? a as vertebrates evolved, mutations in hox genes led to new vertebral organization during embryological development. b. as vertebrates evolved, mutations in hox genes directly resulted in new proteins that determined vertebrae. c. long before vertebrates evolved, a wide variety of hox genes developed, and many coded for vertebral structures. d. environmental factors, which differ among vertebrate groups, activate specific hox genes that code for specific structures.

Explanation:

Answer:

A. As vertebrates evolved, mutations in Hox genes led to new vertebral organization during embryological development