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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The slow block to polyspermy:

a. is caused by a change in membrane potential from negative topositive.

b. triggers the movement of Ca2+ from the cytosol to the endoplasmic reticulum.

c. triggers a decrease in egg oxidation and protein synthesis.

d. describes the fusion of egg and sperm nuclei.

e. includes the fusion of cortical granules with the egg’s plasmamembrane.

Summary Introduction

Introduction:

Fertilization includes fusion of sperm with the egg followed by the nourishment of embryo to develop a healthy offspring. Polyspermy refers to the fertilization of an egg by more than one sperm, which causes abnormalities. The phenomena of the slow block and fast block take place in polyspermy in order to avoid abnormalities.

Explanation

Justification/explanation for the correct answer:

Option (e) states that slow block to polyspermy includes the fusion of cortical granules with the egg’s plasma membrane. The slow block to polyspermy includes the changes in the egg’s membrane, zona pellucida that restricts the further entry of sperms. This occurs as the cortical granules react with the egg’s membrane performing a cortical reaction and blocking the polyspermy. Hence, option (e) is correct

The explanation for the incorrect answers:

Option (a) states that the change in membrane potential from negative to positive is caused by slow block to polyspermy. The change in membrane potential acts as a fast block to polyspermy. The opening of Na+ (sodium) takes place in the fast block to polyspermy. Sodium ions flow into the egg and depolarization of the membrane takes place. This does not allow more sperms to enter the egg. So, it is an incorrect option...

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