Dear student,
The fusion of the male and female gamete to form the zygote is called as the fertilisation.
In humans, it involves the fusion of the sperm and ovum or egg to form the zygote. The sperm is formed by the male body in the testes and the ovum or egg is produced by the female body in the ovary.
The sperm moves from the male reproductive parts to the female reproductive parts and fuses in the fallopian tubes of the female reproductive system to form the zygote.
Regards