The presence of the same homeotic genes in a wide range of organisms for producing set patterns is an indication that
A)evolution solved certain developmental problems just once.
B)all organisms are composed of exactly the same proteins.
C)the same homeotic mutations are likely to appear in all organisms.
D)essentially we can complete the genome mapping of all animals in a short time.
E)structures remain fairly constant,but regulation of animal development varies widely across the kingdom.

Question

Quizplus · Accepted Answer

The presence of the same homeotic genes in a wide range of organisms for producing set patterns suggests that evolution solved certain developmental problems just once, and these genes were conserved and used repeatedly by different organisms. This concept is known as deep homology, and it supports the idea that all living organisms share a common ancestry.

The Presence of the Same Homeotic Genes in a Wide