Grey crescent is present in

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(A) The grey crescent is a specialized,crescent-shaped region that appears on the surface of a fertilized frog egg. It forms in the animal hemisphere

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Fertilized egg of frog

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(A) The grey crescent is a specialized,crescent-shaped region that appears on the surface of a fertilized frog egg. It forms in the animal hemisphere opposite the point of sperm entry. This region is crucial as it marks the site where the dorsal lip of the blastopore will develop during gastrulation,which eventually gives rise to the notochord and the nervous system.

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