Chapter 20 - Processes of Evolution - 20.3 - Evolution Can Be Measured by Changes in Allele Frequencies - 20.3 Recap - Learning Outcomes - Page 436: 1

The significant differences in vertebrae columns are the result of spatial patterns of Hox gene expression that control the transitions from one body area to another. For example, the anterior limit of Hoxc6 expression is at the borderline between the cervical and thoracic vertebrae in both birds and mammals.

The significant differences in vertebrae columns are the result of spatial patterns of Hox gene expression that control the transitions from one body area to another. For example, the anterior limit of Hoxc6 expression is at the borderline between the cervical and thoracic vertebrae in both birds and mammals.