Question

In frog, holoblastic cleavage is not found due to

• A. A dark pigment in animal pole
• B. Heavy yolk in vegetal pole
• C. Yolk concentrated in center of egg
• D. Nucleus is assymetrical in position

Answer 1

The correct option is B Heavy yolk in vegetal pole

Frog has telolecithal egg. Here, yolk is more concentrated on one end of the egg, the vegetal hemisphere with the cytoplasm plus the nucleus concentrated at the other end, the animal hemisphere. In such kind of eggs, complete or holoblastic cleavage is not possible. So, here, meroblastic cleavage occurs.
Thus, the correct answer is option B.