Zygote: Definition, Formation, Timeline, Totipotency, and Role in Human Development
A zygote is the single, diploid cell formed when a sperm fertilizes an egg. In humans, it forms in the fallopian tube, begins rapid mitotic divisions (cleavage), and develops into a morula by day 3–4 and a blastocyst by day 5–6, typically implanting around day 6–7. The zygote is totipotent, meaning it can give rise … Read more
