Pilíře darwinismu

Tento měsíc si připomínáme 150. výročí vydání knihy O původu druhů Charlese Darwina. Evoluční teorie, kterou Darwin vamp#160;této skvělé knize formuloval, se opírá o dva pilíře: o myšlenku vývoje samp#160;úpravami a o myšlenku přirozeného výběru.

Darwin věřil, že současné organismy jsou potomky mnohem jednodušších předků: že jsou to produkty ničím nepřerušených dědičných linií, které lze zpětně vysledovat až kamp#160;původu života. Dnes máme řadu důkazů, které tuto teorii podporují – od výzkumu starodávných zkamenělin až po poslední objevy vamp#160;oboru molekulární biologie.

Samp#160;myšlenkou vývoje druhů samp#160;úpravami však nepřišel Darwin. Již o padesát let dříve naznačil Jean-Baptiste Lamarck, že živé organismy jsou produkty dlouhého historického procesu transformace. Jím navržené evoluční mechanismy, které zahrnovaly také dědičnost vlastností vyvolaných okolním prostředím, si však nikdy nezískaly oblibu.

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