In a frog,what does the blastopore develop into?

$A$: 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 which of the following animals are cleavage divisions restricted to a small part of the cytoplasm and nucleus in the animal pole of the egg?

The structure which remains unchanged during the metamorphosis of a frog's tadpole is:

At which stage of embryonic development is the fate map prepared?

$A$ phenomenon is termed parthenogenesis when