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
Q. Filming Projection and Technique? Biplane ventriculography is preferred over single plane ventriculography because it gives more information without additional risk to the p

How Sugar is used in Bakery Application? In bakery applications, sugars are used to impart flavor, aroma and color. During the mixing process, excess gluten development can mak

Cystic fibrosis (CF) is caused by a variety of mutations in the CFTR gene. Imagine you have identified a new single-base pair mutation (A→T) in an exon of the CFTR gene. You wish t

Q. How is reproduction done in beings of the class Reptilia? These beings reproduce sexually through internal fecundation by means of copulation between female and male individ

Determine Materials for Separation of Amino Acids by Paper Chromatography? Petridishes (200 mm diameter) with lid, Whatman Chromatographic paper, brown paper, 500 ml separating

Q. What is dengue? The Dengue, or dengue fever, is an epidemic disease in some countries (for instance, in Brazil), and its most dangerous form is hemorrhagic dengue. It is cau

Q. Oxygen comes from the environment and carbon dioxide in the end returns to the environment. How do small animals solve the problem of taking away and bringing these molecules fr

Q. Explain about Anabolism? Anabolism is a process of synthesis or making of larger or complex molecules from smaller molecules. The molecules are of different kinds like hormo

are there non-parasitic viruses

Clostridium perfringens infections Cl. perfringens is a rod-shaped, spore-bearing anaerobic organism. It is capsulated and non-motile. A characteristic feature of the organism