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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 hormones secreted and write their functions by corpus luteum and placenta (any two).
Name the stages in a human female where Corpus luteum and placenta co-exist.
Explain the process of implantation.
Scientific term for the surgical removal of a section of fallopian tube.
Define Placentation
What is true for cleavage?
The solid mass of 8-16 cells formed from zygote after successive mitotic divisions is called ______.
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
The Site of implantation is ______
Where does the first cleavage division of zygote take place?
