Which of the following would most likely lead to the development of two heads in a Drosophila embryo,one at each end?
A) Injecting Nanos protein into the posterior region of the egg
B) Knocking out the expression of the bicoid gene in the anterior region of the egg
C) Knocking out the expression of the bicoid gene in the posterior region of the egg
D) Injecting the posterior region of the egg with cytoplasm from the anterior region of another wild-type egg
E) Injecting the anterior region of the egg with cytoplasm from the posterior region of another wild-type egg

Question

Quizplus · Accepted Answer

Injecting the posterior region of the egg with cytoplasm from the anterior region of another wild-type egg would most likely lead to the development of two heads in a Drosophila embryo, one at each end. This is because the cytoplasm from the anterior region contains high levels of bicoid protein, which determines the head and thorax development, while the cytoplasm from the posterior region contains nanos protein, which determines abdominal development. Injecting the posterior region with the anterior cytoplasm would create a situation where both ends of the embryo have high levels of bicoid protein and low levels of nanos protein, leading to the development of two heads.

Which of the Following Would Most Likely Lead to the Development