Biology lesson

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The difference between the genders.

A normal human cell has 46 chromosomes, of which 44 are autosomes and the two remaining ones sex chromosomes.
Females have two X-chromosomes (so, actually women have 46 autosomes, since those two chromosomes are practically the same). Males have one X-chromosome and one Y-chromosome.
The Y-chromosome is a very small chromosome with only a few genes in it. The most important of those genes is the SRY-gene, the only thing that makes an embroy develop into a male. Another gene identified this far in the Y-chromosome is a gene for hairy ears.
So, the only thing that separates males from females is one single gene that makes the genitals deform into male genitals. Without that gene, the genitals will become female genitals. Practically it means that the female is the base form of humans (and mammals). Also some part in the difference may be that males have only one X-chromosome, so they don't have any backup if there is something wrong with that X-chromosome. That results mostly in defects.
(All the rest of the so-called differences are nothing but a bitter delusion created by culture, parents, upbringing, the society and friends.)

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This is about my X-Men Evolution RPG charater, Kimvekadrei Gillian (or Kaider Getalahan nowadays).

The explanation for Kim being genderless: Kim and her brother Kyle were originally (when their parents' sex cells combined) the same cell, and that cell had two X-chromosomes and one Y-chromosome (should be only one of each) (on the other hand, this is not that a rare chromosome abnormality, there are people like this and they are normal). However, during the first mitosis of that cell the X-chromosomes did not duplicate normally, plus the Y-chromosome was destroyed in the process. One of the X-chromosomes had got that one little SRY-gene that causes the embryo change into a male (i.e. insertion from the Y-chromosome which was then destoyed), and two others had lost the information on sex organs almost completely. The cell then divided, and it happened that the two X-chromosomes without any information of the sex organs got together in the other new cell. Then the only normal X-chromosome got together in the other cell with the X-chromosome that now had the SRY-gene in it. These two cells got separated from each other to both form a new individual. The other one of the cells (the one with the X-chromosomes that had lost the information on sex organs) became Kim and the other (which had the normal X-chromosome and the X-chromosome with the SRY-gene) Kyle. That's why Kim ended up being genderless and Kyle a male.

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Written by [Veltzeh]

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