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प्रश्न
How does zona pellucida of ovum help in preventing polyspermy?
उत्तर
Polyspermy means an egg has been fertilized by more than one sperms. The zona pellucida is modified by proteases. The proteases destroy the protein link between the cell membrane and the vitelline membrane, remove any receptors that other sperm have bound to, and help to form the fertilization membrane that prevents polyspermy.
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संबंधित प्रश्न
Briefly explain the events of fertilisation and implantation in an adult human female.
Name the stage of human embryo at which it gets implanted.
Name the hormones secreted and write their functions by corpus luteum and placenta (any two).
Explain the process of fertilisation and implantation in humans.
Fertilizins are emitted by ______.
Cleavage starts after fertilization in ______.
Test-tube baby means a baby born when ______.
The outermost layer of a blastocyst is called ______.
Where does the first cleavage division of zygote take place?
The zygote passes through several developmental stages till implantation, Describe each stage briefly with suitable diagrams.
