Zygote

Foetus

Zygote is unicellular.

Foetus is multicellular.

Well defined body parts are absent in zygote

In foetus, the body parts can be seen.

It is a fertilized egg formed after the fusion of the sperm with the egg.

It is a stage of the embryo that shows all the main recognizable body parts of a mature organism.

The zygote divides several times to form an embryo.

An embryo gradually develops into a foetus.