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
#question.what is protostomous and deuterostomes development.

The course and ultimate prognosis of ARF is usually directly related to the severity of carditis. The course and prognosis also depends upon recurrence of rheumatic fever. In pre-p

Why is the occurrence of eyelids in amphibians in comparison to their absence in fishes and adaptation to terrestrial life? Eyelids associated to lacrimal glands protect and ke

Can you please describe the differences between continuous traits and discrete traits and how it helps an ecologist measure variation? Please give a few examples.

Q. How does the depolarization of the neuronal membrane start? The primary cause of the neuronal depolarization is the binding of neurotransmitters released in the synapse by t

SOM E COMMON REFLEXES RELATED TO RESPIRATION - 1.      Cough Reflex: Due to stimulation in Trachea before it 2.5 lit. air is inhaled. 2.      Sneezing Reflex: Stimulati

Explain Chronic Infections Fever Chronic  Infections Fever: These are generally of longer and sustained duration. The patients have a past history of repeated episodes or con

Q. Can the heat capacity of water be considered small or large? What is the biological consequence of that characteristic? From Thermology it is acknowledged that the quantity

Transport system in higher animals The circulatory system in higher animals has undergone several changes during evolution. The heart has become totally muscular. It p

Water Water usually forms about 50% to90% part of living protoplasm. Life upon earth originated in the ocean and the conditions of that aqueous primeval environment have been r