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What are the stages of post-fertilization event ? What is the reason that restrict already fertilized egg for further entry of sperm nucleus ?

What are the stages of post-fertilization event ? What is the reason that restrict already fertilized egg for further entry of sperm nucleus ?

Grade:12th pass

1 Answers

Umakant biswal
5359 Points
6 years ago
Events in sexual reproduction after the formation of zygote are called post-fertilisation events.Embryogenesis refers to the process of development of embryo from the zygote. During embryogenesis, zygote undergoes cell division (mitosis) and cell differentiation. While cell divisions increase the number of cells in the developing embryo; cell differentiation helps groups of cells to undergo certain modifications to form specialised tissues and organs to form an organism.Formation of the diploid zygote is universal in all sexually reproducing organisms. 
these 2 are the main post fertilisation event . 
COMING TO YOUR 2nd query 
once 1 sperm enters the ova or fertilised with the ova , then it will change the outer zona pellucida layers and insert a chemical in it , so, that no more sperm can be able to fertilise with it .. 
HOPE IT CLEARS YOUR DOUBT 
ALL THE BEST ..

 

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