During the early part of the cleavage stage in frog development, the rapidly developing cells
A)skip the mitosis phase of the cell cycle.
B)skip the S phase of the cell cycle.
C)skip the G1 and G2 phases of the cell cycle.
D)rapidly increase the volume and mass of the embryo.
E)skip the cytokinesis phase of the cell cycle.

Question

Quizplus · Accepted Answer

During early cleavage in frog development, cells undergo rapid cell division without significant growth or differentiation, which suggests that the cells skip the G1 and G2 phases of the cell cycle. However, they do go through the S phase to replicate their DNA before mitosis, and they also undergo cytokinesis to divide into two daughter cells. Therefore, the best choice is C, which accurately describes the stages that are skipped during early cleavage. Choice A, B, D, or E are all incorrect because they do not reflect the actual events that occur during early cleavage.

During the Early Part of the Cleavage Stage in Frog