Question

Cleavage is found in which of the following?

• A. Zygote
• B. Eggs
• C. Undivided cell
• D. After blastocyst stage

Answer 1

Answer: (A)

The mitotic division starts as the zygote moves through the isthmus of the oviduct called cleavage towards the uterus and forms 2, 4, 8, 16 daughter cells called blastomeres. The embryo with 8 to 16 blastomeres is called a morula). The morula continues to divide and transforms into blastocyst as it moves further into the uterus. $\text{Zygote}\stackrel{\text{Cleavage}}{\to }Morulla\stackrel{\text{Blastulation}}{\to }Blastulla\stackrel{\text{Gastrulation}}{\to }gastrula$