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zona prlucida degenarates after-
 
A. before cleavage
 
B. after cleavage

Asked by anirbanbag81 7th November 2017, 4:29 PM
Answered by Expert
Answer:
  • During the first week before implantation, the conceptus (product of fertilization) undergoes cleavage to form the blastocyst
  • Cells of the inner cell mass become aggregated and form the embryoblast that will form the tissues and organs of the embryo.
  • Cells of the outer cell mass become flattened and form the trophoblast that will contribute to the formation of the extraembryonic supportive membranes.
  • Around this time, the zona pellucida degenerates resulting in “hatching” of the blastocyst from its protective, but a restrictive coat.
  • Once the blastocyst is rid of the zona pellucida it is free to begin implantation into the wall of the uterus.
  • This implies that the zona pellucida degenerates only after cleavage.
Answered by Expert 7th November 2017, 6:31 PM
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