The effect of yolk on cleavage is that
A)yolk promotes faster cleavage.
B)yolk promotes spiral cleavage in all cases.
C)yolk slows down and indirectly determines the type of cleavage to take place.
D)yolk is the origin of all cleavage planes.

Question

Quizplus · Accepted Answer

Yolk has an indirect effect on cleavage by determining the amount and distribution of cytoplasm available for cell division. In organisms with more yolk, cleavage is slower and the type of cleavage that takes place is determined by the distribution of yolk. Therefore, yolk slows down and indirectly determines the type of cleavage to take place.

The Effect of Yolk on Cleavage Is That