What is Zygote and Foetus? An Introduction
FAQs on Difference Between Zygote and Foetus
1. How Long does the Zygote Stage Last?
The zygote stage typically lasts for about two weeks after fertilisation. During this period, the zygote undergoes a rapid series of cell divisions through a process called cleavage. It begins as a single-celled entity and progresses into a cluster of cells known as a blastocyst. The blastocyst then travels through the fallopian tube towards the uterus, where it eventually implants into the uterine lining. The zygote carries the complete set of genetic information required for the development of a new individual, inherited from both the egg and the sperm.
2. At what Point does the Foetus Start Developing?
The fetus stage begins approximately nine weeks after fertilisation and continues until birth. By this time, the embryonic stage has passed, and the major organ systems have formed. The foetus undergoes significant growth and refinement throughout the remaining duration of the pregnancy. During this stage, external features, such as limbs, facial features, and sensory organs, become more distinct. The foetus also experiences further development of its central nervous system, skeletal system, and internal organs.
3. Can a Zygote Survive Outside the Womb?
No, a zygote cannot survive outside the womb. It requires the support and nourishment provided by the mother's body to continue developing into an embryo and subsequently a foetus. Once the zygote implants into the uterine lining, it establishes a connection with the mother's circulatory system through the placenta. The placenta facilitates the exchange of oxygen, nutrients, and waste products between the mother and the developing embryo/foetus. The womb provides the optimal environment with stable temperature, protection, and the necessary resources for the zygote's growth and development.