The bicoid gene product is normally localized to the anterior end of the embryo. If large amounts of the product were injected into the posterior end as well, which of the following would occur?
A) The embryo would grow to an unusually large size.
B) The embryo would grow extra wings and legs.
C) The embryo would probably show no anterior development and die.
D) Anterior structures would form in both sides of the embryo.
E) The embryo would develop normally.

Question

Quizplus · Accepted Answer

The bicoid gene product is a morphogen that specifies anterior structures in developing embryos, particularly in Drosophila (fruit flies). If it were injected into the posterior end, anterior structures would form at both ends of the embryo, leading to the development of anterior structures in both the normal anterior and the manipulated posterior sides.

The Bicoid Gene Product Is Normally Localized to the Anterior