Question

Define cleavage and describe how it differentiate from typical cell division.

Answer 1

Cleavage is the successful repeated division of the single celled zygote to give rise to group of smaller cells . A cleavage in which the entire egg gets divided in to equally sized blastomeres is called simple holoblastic cleavage or partial cleavage called meroblastic cleavage.. The division line or furrows of cleavage are called cleavage planes. cells derived from cleavage are called blastomeres and form a compact mass called the morula. cleavage ends with the formation of blastula.

• The cleavage differ from other forms of cell division in that it increases the number of cells and the nuclear mass without increasing the cytoplasmic mass.
• cleavage is cytoplasmic division which follows nuclear division , where as cell division is the process in which parent cell divided into two daughter cells.
• cleavage occurs in only animal cells, cell divion occurs in both plant and animal cell.
• clevage is also called cytokinesis ,but cell division two steps karyokinesis and cytokinesis
• cleavage involves actin filament,myosin filaments, and contractile ring . Cell divion involves mitotic spindle made up of microtubules.