Gen


Et gen er en biologisk enhed for information om en given arvelig l se ud.

Et gen kan for eksempel indeholde information om fremstilling af et enzym, der er et protein, som indgår i nedbrydningen af fødevarer for at omsætte dem til energi.

Forskellige organismer har ikke det samme antal gener. Encellede bakteriers arvemasse har cirka 4.000 gener, en gærcelle har 6.000 gener, planter har et meget varierende antal gener, og dyr har mellem 50-100.000 gener. Mennesket har cirka 35.000 gener. Generne består af DNA og er anbragt på cellens kromosomer.

Ordet gen indførtes i 1909 af den danske biolog Wilhelm Johannsen.

Se også

Eksterne kilder/henvisninger

Kategori:Genetik


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