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Originally Posted by pluiepoco
to form a baby, X must meet Y to combine and synthesize into genes, and then ... them...tissues and organs and at last human body. Note me if I was saying wrong.
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ooops seems you are mixing up some knowledge here.
To start from the cell (which can be considered as the unit in body construction) each one of us come from a single cell: when the spermatozoid meets the ovule it makes the first cell of the future baby.
Then this cell has a nucleus in which there are 46 different chromosomes. They form 26 pairs, which means every chromosome has a twin which is: there are 2 chromosome number 1, 2 chromosome number 2, 2 chromosomes number 3 and so forth until 23. In each pair there is a chromosome from the mom and the other one from the dad. Chromosomes from a same pair are identitcal.
The last pair is the sexual pair, which means it is whether XX or XY. depending on what the father gave.
Now on each chromosme there are several genes. Basically each gene of each chromosome codes for a different molecule of your body.
Let's say XX and XY do not express exactly the same genes, so that it gives whether girls or boys.
Hope I have been clear to you pluiepoco and to others
and for those who would like more details please ask, this a huge summary, which does not reflect the exact reality as we know it nowadays
