Refer to the figure showing fertilization in an amphibian egg. Predict where the gray crescent will form and what region of the embryo this will mark.
A) It will form at point "a" and mark the dorsal region.
B) It will form at point "b" and mark the ventral region.
C) It will form at point "c" and mark the dorsal region.
D) It will form at point "d" and mark the ventral region.
E) It will form at point "a" and mark the ventral region.

Question

Refer to the figure showing fertilization in an amphibian egg.  Predict where the gray crescent will form and what region of the embryo this will mark.
A) It will form at point "a" and mark the dorsal region. 
B) It will form at point "b" and mark the ventral region. 
C) It will form at point "c" and mark the dorsal region. 
D) It will form at point "d" and mark the ventral region. 
E) It will form at point "a" and mark the ventral region.

Quizplus · Accepted Answer

The gray crescent forms on the side of the egg opposite of where the sperm entered (point "c"), and it marks the dorsal region of the embryo.

Refer to the Figure Showing Fertilization in an Amphibian Egg