In developmental biology, the term Zygote is used to describe the first stage of a new organism when it consists of just a single cell.

A Zygote is produced by the fertilization of a ovum by a sperm cell and they will later develop into an embryo.

Associated Terms: Zygocyte

Also see:
Embryo
Foetus
Placenta
Uterus
Gestation Period
Delayed Implantation
Fertilization
Sexual Reproduction