Ovuloom📖 Zygote
The single cell formed when a sperm fertilizes an egg. It contains a complete set of 46 chromosomes (23 from each parent) and is the very first stage of human development.
In Detail
The zygote exists for only about 24-30 hours before its first cell division. During this time, the maternal and paternal DNA combines, determining the baby's genetic makeup — sex, eye color, and thousands of other traits are set at this moment. The zygote then divides into 2 cells, then 4, then 8 (cleavage stage), becoming a morula by day 3-4 and a blastocyst by day 5-6. Each division occurs approximately every 12-20 hours.
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