Advertisements
Advertisements
Question
How does zona pellucida of ovum help in preventing polyspermy?
Solution
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.
APPEARS IN
RELATED QUESTIONS
Name the stage of human embryo at which it gets implanted.
The zygote divides to form __________ which is implanted in uterus.
The structure which provides vascular connection between the foetus and uterus is called __________.
Name the hormones secreted and write their functions by corpus luteum and placenta (any two).
How is polyspermy prevented in humans?
State three functions of the placenta
During cleavage, what is true about cells?
What is true for cleavage?
Implantation takes place after ______ of fertilisation.
Blastomeres found in the outer layer of blastocyst are
