Some researchers claim that sponge genomes have homeotic genes, but no Hox genes. If True, this finding would
A)strengthen sponges' evolutionary ties to the eumetazoa.
B)mean that sponges must no longer be classified as animals.
C)confirm the identity of sponges as "basal animals."
D)mean that extinct sponges must have been the last common ancestor of animals and fungi.
E)require sponges to be reclassified as choanoflagellates.

Question

Quizplus · Accepted Answer

The presence of homeotic genes in sponge genomes supports their position as basal animals, meaning they diverged early from the rest of the animal kingdom. In contrast, Hox genes are a characteristic feature of eumetazoan animals and are involved in the development of body plans, such as segmentation. The fact that sponges do not have Hox genes further confirms their position as basal animals, and provides insight into the evolution of animal body plans. The absence of Hox genes in sponges would not mean they are no longer classified as animals, as their other features and characteristics still align with other animals.

Some Researchers Claim That Sponge Genomes Have Homeotic Genes, but No