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Differentiate between Foetus and Zygote.

Last updated date: 20th Jun 2024
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Zygote and Foetus are the two different types of terminologies, which refer to the developmental stages inside the mother’s womb. The zygote is the initial stage in the baby's development. This stage is also known as a fertilized ovum formed from the union of the sperm cell as well as the egg cell. Foetus refers to the last or final stage in the baby’s development.

Complete answer:
Both zygote and foetus are parts of different stages of human development. These stages of human development are given below:
ZYGOTIC STAGE: The formation of zygote takes place in the female body when there is a fusion between the male gamete (sperm) and the female gamete (egg).
BLASTOCYST STAGE: After the first stage (formation of zygote), the second stage begins in which zygote starts to divide into the solid ball of the cell.
EMBRYONIC STAGE: During the third stage, embryo formation takes place along with the formation of internal organs such as the brain, heart, and spinal cord. External features such as arms and legs also begin to develop.
FOETUS STAGE: The stage after the formation of the embryo, the organism starts to grow more and is known as a foetus.

A zygote is formed by the fusion of the nuclei of the sperm and egg.The foetus is the stage of the embryo which nearly resembles a human being.
It has a unicellular structure.It has a multicellular structure.
This stage occurs after the processes of fertilization.Foetus stage occurs after the processes of cell division and cell labour division.
In Zygote a well-described body is absent.In Foetus well-described body parts are present.

Zygote is a fertilized egg formed after the fusion of the sperm with the egg. It divides several times to form an embryo. On the other hand, Foetus is a stage of the embryo that shows all the main recognizable body parts of a mature organism.