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Paulla nagra³a To co da³ nam ¶wiat w ho³dzie Krzysztofowi Krawczykowi - zobacz teledysk
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Paulla: Przy muzyce Krzysztofa Krawczyka rodzi³y siê te¿ cichutko moje marzenia
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IMAGE: Using an experimental technique whereby flowers can be coaxed to form from plant roots, biologists led by the University of Pennsylvania s Doris Wagner uncovered a protein that enables for the. view more
Credit: University of Pennsylvania
Cells don t express all the genes they contain all the time. The portion of our genome that encodes eye color, for example, doesn t need to be turned on in liver cells. In plants, genes encoding the structure of a flower can be turned off in cells that will form a leaf.
These unneeded genes are kept from becoming active by being stowed in dense chromatin, a tightly packed bundle of genetic material laced with proteins.