Hox genes: homeobox genes; Hox proteins encode and specify the position of parts during development
Which model most accurately describes how Hox genes regulate embryonic development in Drosophila?
A. Hox gene expression does not overlap among segments or parasegments. The product of each gene is confined to its own domain along the anterior-posterior axis to specify identity.
B. Hox gene expression is necessary for segment formation. The absence of Hox gene expression leads to a lack of segment formation.
C. Hox gene expression corresponds to segmental boundaries. It is the unique combination of Hox gene products that mark the boundaries of each segment.
D. Hox gene expression marks the boundaries of parasegments. Each parasegment expresses a unique combination of Hox gene products that give rise to the identity of each parasegment.