Difference between w zona pellucida and corona radiata
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Explanation:
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Answer:
The key difference between zona pellucida and corona radiata is that zona pellucida is a non-cellular secretory glycoprotein layer that surrounds the plasma membrane of mammalian ovum while corona radiata is a follicle cell layer that surrounds zona pellucida.
In fertilization, a mature ovum fuses with a sperm. Generally, fertilization takes place only between one sperm and an ovum. In order to prevent additional sperms from entering inside the cytoplasm of ovum, there are several protective layers surrounding the ovum. Zona pellucida and corona radiata are two such protective layers that surround and protect the mature ovum. Zona pellucida is a glycoprotein shell which is non-cellular while corona radiata is a cellular layer.