Give an account of pre-fertilisation events?

Explanation

Pre-fertilization events: These are the events which occur prior to the fusion of gametes. Pre-fertilization events include gametogenesis and gamete transfer.
Gametogenesis : Gametogenesis is the process by which male and female sex cells or gametes are formed. Gametes are haploid cells. In some algae, the two gametes are similar in appearance (morphology) and are called homogametes (=isogametes), such gametes cannot be distinguished into male and female gametes. However, in majority of sexually reproducing organisms the gametes formed are of two morphologically distinct types, called heterogametes. In such organisms, the male gamete is called the antherozoid or sperm and the female gamete is called the egg or ovum.
Gamete transfer : When the male and female gametes are formed, they are physically brought together so as to facilitate their fusion. In most of the organisms, the male gamete is motile, whereas the female gamete is non-motile or stationary.