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G*U*L*I*S*T*A*N
21.03.2005., ponedjeljak
XX rules

Natureov fokus na X-kromosom

DNK sekvenca X-kromosoma dekodirana je u potpunosti i pokazalo se da sadrzi veliki broj gena bitnih za vise kognitivne funkcije, statisticki znacajna grupacija.

Genetics: The X factor

Muskarci imaju samo jednu kopiju, dakle izlozeni su vecoj opasnosti od raznih mentalnih bolesti koje uvjetuju mutacije na X kromosomu, sto objasnjava vec dugo poznatu cinjenicu da je veci broj muskih idiota. Doslovno. :)

Dalje, zene imaju dvije kopije X-kromosoma u svim somatskim stanicama, dakle potrebno je jednu kopiju "iskljuciti", da bi se ostvario genetski balans. Ranije se smatralo da je jedna kopija POTPUNO iskljucena, no nije tako: izvjestan broj gena aktivan je i sa "nijemog" X-kromosoma. Da bi slika bila jos slozenija, ovo "usutkavanje" jednog X-kromosoma je vjerojatno potpuno slucajno: u svakoj somatskoj stanici bit ce iskljucen bilo maternji bilo ocev X-kromosom, randomly. Sve zene su mozaici po X-kromosomu--genetski kompleksnije i raznovrsnije od muskaraca...

Komentar Timesove kolumnistice Dowd:

Research published last week in the journal Nature reveals that women are genetically more complex than scientists ever imagined, while men remain the simple creatures they appear.

"Alas," said one of the authors of the study, the Duke University genome expert Huntington Willard, "genetically speaking, if you've met one man, you've met them all. We are, I hate to say it, predictable. You can't say that about women. Men and women are farther apart than we ever knew. It's not Mars or Venus. It's Mars or Venus, Pluto, Jupiter and who knows what other planets."

Women are not only more different from men than we knew. Women are more different from each other than we knew - creatures of "infinite variety," as Shakespeare wrote.

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