With the current knowledge. We know that the process of development as an embryo (development) started from. When reproductive cells (eggs and sapoem) are mixed. Remove the substance from the genetic father and mother each half of a chromosome pair 23 is a cell that contains this is an egg that has been already fertilization (fertilized egg, or zygote, also known as), and then onwards to the cells gradually over a period of about two weeks. Some reproductive biologist who proposed to use the term "pre-embryo for calling at this stage, rather than weaknesses, using the term practical reasons, embryo, rather than scientific reasons.
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