Zygote
Updated:A zygote is the very first stage of human development, formed when a sperm cell successfully fertilizes an egg cell (ovum). This single-celled organism contains the combined genetic material from both the egg and sperm, creating a unique set of DNA. The zygote marks the beginning of pregnancy and represents the earliest form of a potential human life.
Additional Information
After fertilization, the zygote begins a process of rapid cell division called cleavage. This process continues as the zygote travels down the fallopian tube towards the uterus. About 5-6 days after fertilization, the zygote develops into a blastocyst, which then implants in the uterine wall, marking the next stage of embryonic development.
It's important to note that not all zygotes successfully develop into embryos. Many factors can affect the viability of a zygote, including genetic abnormalities, environmental factors, and the overall health of the person carrying the pregnancy.
Examples
In vitro fertilization (IVF) involves creating zygotes outside the body and then implanting them in the uterus.
Some forms of contraception work by preventing the formation of a zygote, either by stopping ovulation or by creating a barrier that prevents sperm from reaching the egg.