Question

What is true about cleavage in the fertilized egg of humans?

• A. It is meroblastic.
• B. It starts, when the egg is in fallopian tube.
• C. It is identical to the normal mitosis.
• D. It starts, when the egg reaches in uterus.

Answer 1

The correct option is B It starts, when the egg is in fallopian tube.

In humans, the egg cleavage is homoblastic. Cleavage results in the production of cluster of cells, which is of the same size as that of zygote.
Cleavage is not identical to mitosis. The cleavage starts when the egg is in fallopian tube and not in uterus.
Thus, the correct answer is option B.