Fertilisation and Implantation

The video explains the process of human fertilization, which occurs internally within the female body. It details the journey of sperm to the ovum, the fusion process, and the formation of a zygote. The video also covers the formation of identical and fraternal twins, the role of chromosomes in sex determination, and the development stages of the zygote, including cleavage and implantation into the uterine lining.

How does the sex of the baby depend on the sperm?

What is cleavage in the context of embryonic development?

What is implantation and when does it occur after fertilization?