You find some marine eggs that were recently laid.The eggs are small with clear cytoplasm.You stain one egg for yolk and find faint staining relatively evenly distributed throughout the cytoplasm.When cleavage begins in the unstained eggs, you are not surprised to see that the pattern of cleavage is
A) spiral.
B) discoidal.
C) incomplete.
D) superficial.
E) rotational.

Question

Quizplus · Accepted Answer

The description of the eggs as small with clear cytoplasm and faint, evenly distributed yolk staining suggests that they are likely from an organism that undergoes spiral cleavage, a pattern characteristic of many marine invertebrates, particularly those within the group Lophotrochozoa, such as mollusks and annelids. Spiral cleavage is marked by cells dividing at oblique angles to one another.

You Find Some Marine Eggs That Were Recently Laid