Question

which type of of stem cells first develops in a blastocyst ?

Answer 1

Embryonic stem cells (ES cells or ESCs) are pluripotent stem cellsderived from the inner cell mass of ablastocyst, an early-stage pre-implantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells.

Answer 2

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at first the endoderm is formed then ectoderm and then at last mesoderm is formed.
the blastomere in the blastocyst are arranged into an outer layer trophoblast and inner group of cell attached to trophoblast called the inner cell mass.

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