Appendix 2
The Development of the Unborn Child's Body

 

Zygote

 

Timing

Source
An embryo, or a new human, comes into existence when a zygote is produced at fertilization by the combination of a sperm with an ovum.
At conception Moore, p 2
The sperm has 23 chromosomes and so does the ovum, but the zygote has 46 chromosomes. Although half of its chromosomes come from each parent, the zygote is genetically different than either of them, and is, in fact, genetically unique. At fertilization Moore, p 37


 


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