The simplest hypothesis for the original function of Hox genes is that the common ancestor of bilateral animals had Hox genes that were ________.
A) expressed in the development of its appendages
B) scattered throughout the genome
C) expressed in the canonical spatial pattern
D) crucial for the development of its digestive system
E) organized in multiple clusters

Question

Quizplus · Accepted Answer

Hox genes are known for their role in determining the body plan of an organism along the anterior-posterior axis by being expressed in a specific spatial pattern. This canonical spatial pattern of expression is a fundamental characteristic of Hox genes, suggesting that their original function in the common ancestor of bilateral animals was to establish basic body structure.

The Simplest Hypothesis for the Original Function of Hox Genes