In a developing frog embryo, most of the yolk is
A) located near the animal pole.
B) located near the vegetal pole.
C) found within the cleavage furrow.
D) found within the blastocoels.
E) distributed equally throughout the embryo.

Question

Quizplus · Accepted Answer

In a developing frog embryo, most of the yolk is located near the vegetal pole. The vegetal pole is the yolk-rich region, whereas the animal pole is yolk-poor. As the embryo develops, cleavage occurs more rapidly in the animal pole, leading to the formation of a blastula with a fluid-filled cavity (blastocoel) and a thin layer of cells (blastoderm) around it. However, the cells at the vegetal pole are much larger and less active in cleavage.

In a Developing Frog Embryo, Most of the Yolk Is