Question

Why oocyte in menstrual cycle should be fertilized within 24 hours?

Answer 1

If oocyte in menstrual cycle are not fertilized in 24 hrs, then it may cause diseases such as down syndrome,etc to new born

Answer 2

Corpus luteum secretes large amounts of progesterone which is essential for maintenance of endometrium which is thickened by estrogen.

After the egg release, it moves into fallopian tube. It stay there for about 24hr, waiting for single sperm to fertilise it.. If fertilisation does not occur the egg dissolve after 24hr. This is menstruation..