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Abia dupa 60 de zile de dezvoltare, embrionii care au un cromozom Y devin influenţaţi de hormonul testosteron, care schimbă activitatea genetică a celulelor şi modifică astfel şi dezvoltarea organelor genitale şi a creierului.
Dar, în acest moment, celulele care vor forma sfârcurile sunt deja în embrion, iar apariţia acestor caracteristici este inevitabilă.
Totuşi, spre deosebire de alte mamifere, bărbaţii au nervi şi vase de sânge în zona mameloanelor, iar întrebarea este de ce.
O posibilă explicaţie este aceea că selecţia naturală nu a dus în timp la dispariţia lor pentru că aceste caracteristici sunt inofensive, nu dăunează şi nu au împiedicat evoluţia speciei noastre.
Sursa: Live Science
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