Question

What is clevage(comes before implantation)?
Explain.

Answer 1

Cleavage(embryo)::

cleavage is the division of cells in the early
embryo. The process follows fertilization, with the transfer being triggered by the activation of acyclin-dependent kinase complex.[1]. The zygotes of many species undergo rapid
cell cycles with no significant overall growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres and form a compact mass called themorula. Cleavage ends with the formation of theblastula.
Depending mostly on the amount of yolk in the egg, the cleavage can be holoblastic(total or entire cleavage) or meroblastic(partial cleavage).The pole of the egg with the highest
concentration of yolk is referred to as the
vegetal pole while the opposite is referred to as the animal pole.