Extrusion of second polar body from egg nucleus occurs
after entry of sperm but before fertilization
after fertilization
before entry of sperm into ovum
simultaneously with first cleavage
Graafian follicle are characteristically found in the
What is oogenesis? Give a brief account of oogenesis.
How many ova and sperms would be produced from $100$ secondary oocytes and $100$ secondary spermatocytes during gametogenesis in human
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
In mammals growing oocytes are surrounded by special nutritive cells called