Blob or Baby? - Answers in Genesis: Recent research has found that differentiation of the embryonic cells begins on the day of conception and may even be initiated by the point of entry of the sperm into the egg. When egg and sperm unite, they produce a single new cell, called the “zygote,” and the zygote is the first cell in the body of the new baby. When the zygote undergoes its first cell division to produce a two-celled embryo, it now appears that these two cells form the top-tail axis for all subsequent development. In other words, which part will be the head, for instance, is determined “up front.” And similar processes of orientation appear to continue during all subsequent cell divisions.
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