Search any question & find its solution
Question:
Answered & Verified by Expert
Grey crescent is the area:
Options:
Solution:
2329 Upvotes
Verified Answer
The correct answer is:
just opposite to the site of entry of sperm into ovum
Grey crescent marks the future dorsal side of the embryo. Subsequently, it was determined that the Grey Crescent is formed by the $30^{\circ}$ rotation of the fertilized egg to form a dorsal/ ventral axis. The crescent thus serves as a determinant of dorsal / ventral polarity: cells without it have no means of orientation.
Related Theory
In the zygote of the frog, there are two poles present. The vegetal pole and the animal pole. These are separated by an area which is rich in melanin and is known as the grey crescent. The egg enters enter opposite to the region of sperm entry. The broadest part of the grey crescent forms the dorsal end. The grey crescent helps in establishing polarity.
Related Theory
In the zygote of the frog, there are two poles present. The vegetal pole and the animal pole. These are separated by an area which is rich in melanin and is known as the grey crescent. The egg enters enter opposite to the region of sperm entry. The broadest part of the grey crescent forms the dorsal end. The grey crescent helps in establishing polarity.
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.