This produces a new cell called a zygote, which will mature into an embryo. The number of cells increase by mitosis, and as the embryo develops, the cells begin to differentiate (or specialise).
An egg becomes fertilized when a sperm penetrates it, creating a zygote. For the first eight weeks, the developing baby is called an embryo. It looks like a tadpole. At about three weeks ...
The zygote elongates and then divides asymmetrically ... This division forms the apical cell, which develops into the embryo, and the large basal cell, which develops into the suspensor.