The cleavage in a frog is:

What treatment causes a frog tadpole to grow into a giant tadpole?

$A$: In frog,a gray crescent is formed during fertilization.
$R$: It is because the black pigment granules move away from the point of entry of the sperm in the animal half.

In frogs and other vertebrates,the entire nervous system,including the ganglia,is derived from which germ layer?

Grey crescent is present in

In frog,equal holoblastic cleavage is not found due to: