What is the ploidy of germ cells?

The formation of polar bodies occurs during the formation of which of the following?

If two primary spermatocytes and two primary oocytes undergo meiosis simultaneously,what will be the ratio of spermatozoa and ova produced at the end of the gametogenesis?

In the given diagram of human sperm,identify the functions of the labelled parts $A$,$B$ and $C$.

Who discovered the human sperm?

In humans,sperms move after ejaculation at a rate of nearly