Meroblastic Cleavage Occurs In

Question

Meroblastic cleavage occurs in
A) sea urchins, but not humans or birds.
B) humans, but not sea urchins or birds.
C) birds, but not sea urchins or humans.
D) both sea urchins and birds, but not humans.
E) both humans and birds, but not sea urchins.

Accepted Answer

Meroblastic cleavage, which is incomplete cell division, occurs in birds and other animals with large yolk-rich eggs, such as fish and reptiles, but not in sea urchins or humans. Sea urchins and humans undergo holoblastic cleavage, where the entire egg divides completely.