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A blastocyst typically has around 100-200 cells by day 5 after fertilization. These cells are organized into an outer layer called the trophectoderm that will eventually form the placenta, and an inner cell mass that will develop into the embryo.
an unfertilized egg
A few Days after Fertilization. (apex)
Meiosis 1*2*3*4*5*6*7 = 5040
Yes, mitosis is the process by which cells divide to create new cells in the zygote's body, allowing for growth and development. Through repeated rounds of mitosis, the zygote goes through cell division and differentiation to form tissues, organs, and ultimately a complete organism.
Embryonic stem cells refer to pluripotent cells that are generally derived from the inner cell mass of blastocysts (day 5). Stem cells have been derived from gonadal ridges and mesenteries (3200 to 4000) extracted from aborted five-to-nine week old human embryos.