Question

Which of the following attribute is true about cleavage?

• A. Daughter cells or blastomeres grow in size equal to parent cell
• B. Blastomeres separate
• C. Cytoplasm of blastomeres increases after each division
• D. There is no growth of daughter cells

Answer 1

The correct option is D There is no growth of daughter cells

The term cleavage refers to a series of rapid mitotic division of the zygote following fertilization, forming a many celled blastula. The cleavage follows fertilization and ends with the formation of a $32$-celled stage. In cleavage, there is no growth phase. The size of the embryo remains same while size of the daughter cells decreases. Cytoplasm of each daughter cells decreases and the blastomeres remain together till the completion of this stage. Consumption of oxygen increases as number of cells increases. Nuclear cytoplasmic ratio increases in cleavage.

So the correct answer is D.