Biology 2nd Edition by Robert Brooker, Eric Widmaier ,Linda Graham ,Peter Stiling

تمرين 13

The observation that the mammalian Pax6 gene and the Drosophila eyeless gene are homologous genes that promote the formation of different types of eyes suggests that
A) Drosophila eyes are more complex.
B) mammalian eyes are more complex.
C) eyes arose once during evolution.
D) eyes arose at least twice during evolution.
E) eye development is a simple process.