Which statement about cleavage in placental mammals is corre

Which statement about cleavage in placental mammals is correct?

A. It results in a blastula that consists of a hollow ball of cells, one cell-layer thick.

B. Unlike cleavage in sea urchins and frogs, gene products expressed by blastomeres affect cleavage.

C. The number of cells typically increases from 1 to 2 to 4 to 8 to 16, and so on.

Solution

Statement 1&3 are incorrect.

In placental mammals, blastocyst is not one layered.

Correct statement is (B)

.B Unlike cleavage in sea urchins and frogs, gene products expressed by blastomeres affect cleavage.