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Why is zona pellucida retained around th...

Why is zona pellucida retained around the egg till it reaches uterus?

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Zona pellucida is retained around the fertilized egg, to keep it protected and viable and also to prevent the implantation of blastocyst in fallopian tube or any other abnormal site.
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Zona pellucida disintegrates just:

Zona pellucida is retained for sometime after fertilization.

A : in morula stage the cells divide without any increase in size R : zona pellucida remains intact till cleavage is completed

Assertion : Zona pellucida is glycoproteinous in nature and dissolved during the event of implantation . Reason : The blastocyst , along with zona pellucida enters in decidua of uterus to protect itself from uterine acidic medium .