The anterior and posterior ends of a Drosophila embryo are determined by _______ that are active _______ fertilization and result in a gradient of the protein _______.
A) segmentation genes; before and after; Bicoid
B) maternal effect genes; before; Hunchback
C) organ identity genes; before and after; Nanos
D) organ identity genes; after; Hunchback
E) maternal effect genes; before and after; Hunchback

Question

Quizplus · Accepted Answer

Maternal effect genes are active before fertilization and result in a gradient of the protein Bicoid, which determines the anterior and posterior ends of a Drosophila embryo.

The Anterior and Posterior Ends of a Drosophila Embryo Are