Cazurile acestor copii au ieşit la iveală în anii 1970, când o cercetătoare a ajuns în satul în care ei se năşteau. După îndelungi studii, acest fenomen a primit şi o explicaţie medicală.
De ce se nasc copii „Guevedoces”
În cea de-a opta săptămână de sarcină, se formează organele masculine (până atunci sunt incerte), datorită unui hormon numit dihydro-testosterone.
Acesta determină apariţia trăsăturilor masculine şi formează penisul, iar în lipsa lui fătului îi apare clitorisul.
Copiii Guevedoces au însă o deficienţă genetică, cauzată de lipsa unei enzime care produce apariţia testosteronului, motiv pentru care se nasc cu trăsăturile fetelor.
Spre pubertate, fetele „Guevedoces” (care au la naştere cromozomul XY, specific băieţilor) primesc o nouă doză de testosteron. De această dată, organismul lor răspunde şi astfel încep să se formeze trăsăturile masculine, inclusiv organul sexual.
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