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Appendix 1
The Chronological Development of The Unborn Child
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At Conception
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Timing
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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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The sex of the embryo is determined genetically.
|
At fertilization |
Sadler, p 319 |
Genetic sex is established.
|
At fertilization |
Williams,
p 180
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The embryo's chromosomal sex is determined.
|
At fertilization |
Moore, p 37 |
The difference between a male and
a female is
determined genetically at the time of conception
|
At conception |
Rugh, p 7 |
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