Vertebrae are differentiated during embryonic development by the
A) amount of spongy bone present.
B) length of the backbone.
C) degree of structural support needed.
D) pattern of homeotic gene expression.

Question

Quizplus · Accepted Answer

Vertebrae are differentiated during embryonic development by the pattern of homeotic gene expression, which determines the specific identity and location of each vertebra. Homeotic genes control the development of body segments and provide positional information, which is critical for the proper differentiation of vertebrae. The expression of these genes is regulated by signaling molecules and transcription factors, which vary along the length of the developing embryo. As a result, each vertebra acquires a unique identity based on its location along the spine.

Vertebrae Are Differentiated During Embryonic Development by the