Differences in the expression of the gene _______ account for many of the phenotypic differences between freshwater and marine forms of three-spine sticklebacks.
A) Bicoid
B) Pax6
C) Pitx1
D) Ubx
E) Gremlin

Question

Quizplus · Accepted Answer

The gene Pitx1 has been shown to be involved in the development of pelvic structures in three-spine sticklebacks. The freshwater forms have a higher expression of Pitx1, which leads to the development of larger pelvic structures. Marine forms have a lower expression of Pitx1, which leads to the reduction or loss of pelvic structures in order to improve swimming performance in open water. The other genes listed are not known to be specifically involved in the differences between freshwater and marine sticklebacks.

Differences in the Expression of the Gene _______ Account for Many