Question

what is the brief process of fertilisation?

Answer 1

Fertilisation is a process in which male and female gamate unite to form zygote either inside or outside of parents body.

Answer 2

union of a spermatozoal nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo. In all organisms the essence of fertilization is, in fact, the fusion of the hereditarymaterial of two different  or gametes, each of which carries half the number of chromosomes typical of the species. The most primitive form of fertilization, found in microorganisms and protozoans, consists of an exchange of genetic material between two cells.