Find out everything you've always wanted to know about identical twins – from how they form to what makes them unique.

These two haploid cells produce a diploid zygote. Hormonal control of reproduction ... in in the control of reproduction in humans The biology of controlling fertility Fertility is the ability ...

Mature ova are released from the ovary into the oviduct where they may be fertilised by sperm to form a zygote. In humans, fertilisation happens inside the woman’s body. This is a process called ...