Grey crescent develops in (1) Eye of frog (2) Fertilized egg of frog (3) Brain of rabbit (4) Eye of cockroach

Answer: (2)

Grey crescent is a crescent-like and grey-coloured area that develops across from the sperm entry point on the amphibian egg surface. This is a surface feature that grows as a result of cytoplasmic movements triggered by the entry of sperm into the egg.

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