Question

Grey crescent is the area

• A. At the point of entry of sperm into ovum.
• B. Just opposite to the site of entry of sperm into ovum.
• C. At the animal pole.
• D. At the vegetal pole.

Answer 1

The correct option is B Just opposite to the site of entry of sperm into ovum.

Gray crescent is a structure formed on the opposite side of sperm entry in a frog egg. It has a bunch of growth factors, that basically regulate, which part of the cell becomes which part of the body. A cortical region of the newly fertilized egg of frogs and some salamanders, that forms just after fertilization on the side opposite of sperm penetration. Hence, option B is correct.