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what is the difference between fast block polyspermy and slow block polyspermy

what is the difference between fast block polyspermy and slow block polyspermy

Grade:12th pass

1 Answers

Jayesh Vashishtha
askIITians Faculty 35 Points
4 months ago
Dear Student,
Here you find your answer

The fast block to polyspermy, which has been best studied in sea urchins, consists of a rapid electrical depolarization of the plasma membrane of the egg. The resting membrane potential of the egg changes from about − 70 to + 10 mV within 2–3 s after fusion of the spermatozoon with the egg.

Whereas the slow block to polyspermy in the sea urchin embryo consists of a physical barrier to further sperm penetration into the egg. The fertilization envelope is formed by the lifting of the vitelline envelope away from the egg plasma membrane.

Askiitians Expert
Jayesh Vashishtha

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