Fusion of sperm and egg, Biology

Fusion of Sperm and the Egg

After the penetration of the extracellular layers by sperm there occurs the fusion of the - sperm plasma membrane with that of the egg. In mammals the fusion begins at the - equatorial region of the sperm head. The plasma membrane of the two cells become continuous to form a cytoplasmic bridge through which the sperm nucleus enters the egg cytoplasm. Usually the entire sperm including the nucleus, centrioles, mitochondria, plasma membrane and even the flagellar axoneme enters the egg cytoplasm. Once the sperm enters the egg there is the formation of the fertilization cone. The fertilization cone is an extension of the egg cytoplasm around the entering sperm head. Microfilaments in the fertilization cone virtually draw the sperm into the egg. Inhibitors of microfilament formation such as cytochalasin B inhibit the formation of fertilization cone and sperm entry into the egg. Figure shows the events occurring during fertilization in sea urchin egg.

1044_Fusion of Sperm and the Egg.png

Figure: Events that occur during the sperm - egg fusion in sea urchin

Posted Date: 1/25/2013 12:17:04 AM | Location : United States







Related Discussions:- Fusion of sperm and egg, Assignment Help, Ask Question on Fusion of sperm and egg, Get Answer, Expert's Help, Fusion of sperm and egg Discussions

Write discussion on Fusion of sperm and egg
Your posts are moderated
Related Questions
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

1.  Explain why a gain of function would be a dominant effect and a loss of function would be a recessive effect. Which types of genes are each associated with: oncogenes or defect

Why Fats have highest heat energy density? Fats have highest heat energy density of 9 Kcal/g. It is the major storage form of energy in body requiring least space and minimum w

Define the term Prebiotics? Dietary Sources and their Mode of Action/health Effects We have already seen how prebiotics are defined. Let us go a little in-depth about them. Pre

Discuss the economic/health impact of any one species of harmful water molds.

The systems of your body are capable of performing specialized functions that keep you alive and enable you to reproduce. In a very general kind of way, a cell is also capable of p

Discuss fatty acid with free radical The hydrogen is removed from the fatty acid chain to yield a free radical. The removal of hydrogen takes place at the carbon atom next to t

Why is quarrantine a must before introduction of a plant species from a dissimilar country? a) What is meant by apoplast pathway? Why does it occur in cortex and not in endoder

Other Complications of Prosthetic Valves :  One of the dreaded complications of mitral valve replacement is ventricular rupture. It is difficult to manage and so it is better avoi

Q. In the phase when the cell is not dividing interphase is there activity within the cell nucleus? In the interphase there is intense metabolic activity in the cell nucleus th