Forelimbs form at the junction of the neck and thoracic vert…
Forelimbs form at the junction of the neck and thoracic vertebrae, the position of which is controlled by HoxC-6 genes. Several kinds of vertebrates from different classes are limbless, including limbless lizards, snakes, and amphibians known as caecilians. All descended from limbed forms. On the basis of recent research in genetics, what would you conclude about the functioning of their HoxC-6 genes?