The fusion of male gamete (sperm) with the female gamete (ova) is known as fertilisation. The process of fertilisation takes place in the fallopian tube. As sperm enter into the vagina through the process of copulation; it moves upwards and enter into the oviduct. In the oviduct, ovum fuse with the sperm to form zygote. The zygote (fertilised egg) get implanted in the inner lining of uterus and undergoes repeated division forming an embryo.

This embryo gets all the requirements from the mother’s body through a special tissue called placenta.