Zygote


Meiosis video


Ovulation and early cleavage video


The process  leading the formation of the zygote begins with the sperm penetration. The sperm reaches the vitelline membrane and excites a cascade reaction in the following sequence  

The formation of male and female pronuclei leads to their fusion and the actual beginning of the zygotic career. The oocyte performs its own protein transcription and translation of essential zygotic proteins until 2 cell stage in the mouse and this leads to change to definitive zygotic transcripts.

 

 

 

 

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Early embryo development

 

 

 

Oluwole Ogunranti

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