describe the process of cleavage.?

Question

clearly please

Answer 1

I don't know too much, but here is what i know. cleavage is the first stage of embryological development and is the division of the zygote immediately following fertilization. as cleavage progesses, the number of cells increases from two to four and then to eight and so on. during cleavage mitotic divisions repidly increase the number of cells, yet the cells do not grow in size. thus the cell divisions of cleavage yield smaller and smaller individual cells. cleavage increases the surface areat to volume ratio of each cell which enhanes gas exchange and other environmental interactions. in most cases cleavage produces a mass of 16 to 64 cells. as the number of dividing cells further increases the mass becomes a hollow ball of cells called the blastula.