cleavage in an egg is speed up or slowed down because
Answers
Answer:
Cleavage in an egg is speed up or slowed down because of amount of yolk.
Explanation:
Cleavage of an egg consists of series of consecutive cell divisions. Blastomeres are formed as result of cleavage. Amount of yolk can influence the cleavage by affecting the cytoplasmic movement during mitosis. Presence of more amount of yolk can reduce the cleavage speed and onset of cleavage partially or completely. Cleavage can be either holoblastic or meroblastic. Cleavage only increases the cell numbers and nuclear mass without increment in cytoplasmic mass.
Cleavage in an 'egg' is 'speed up or slowed' down because :
Cleavage refers to division of cells in early embryo. The process terminates with blastomere formation. The cleavage can be divided in to holoblastic or meroblastic. Holoblastic refers to total or entire cleavage and meroblastic refers to partial cleavage.
The yolk content influence the cleavage during mitosis. The quantity of egg yolk results in reduction of the cleavage speed partially or completely. More the egg yolk lesser the cleavage speed.
Lesser the egg yolk more the cleavage speed. It results in increase in cell numbers and 'nuclear mass' without increasing the "cytoplasmic mass".