Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics.
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KLINKE IZ SRBIJE - MLADE DEVOJKE ZA UPOZNAVANJE DOPISIVANJE I UPOZNAVANJE SA MLADIM DEVOJKAMATinejdžerke koje su rano shvatile šta žele i uzele stvar u svoje ruke kako bi do toga došle.
Mlade i pohotne devojke u potrazi za dobrim frajerima.48, XXYY syndrome results from the presence of an extra copy of both sex chromosomes in each of a male's cells (48, XXYY).
Extra copies of genes on the X chromosome interfere with male sexual development, preventing the testes from functioning normally and reducing the levels of testosterone.48, XXYY syndrome is a condition related to the X and Y chromosomes (the sex chromosomes).
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