how does an embryo develop from a fertilized egg?
A fertilized ovum, (the females egg), develops into a blastocyst, an embryo, then a fetus. If a sperm penetrates the egg, fertilization happens. The fertilized egg (zygote) im â¦ plants into the uterus. The cells of the zygote divide repeatedly as the zygote moves down the fallopian tube. The zygote then takes 3 to 5 days to enter the uterus. In the uterus, the cells continue dividing, becoming a hollow ball of cells called a blastocyst.