TEORIE EVOLUTIVE

NEODARWINISMO

TEORIE EVOLUTIVE

XX SEC

LAMARCK

DARWIN

TEORIE COMPLEMENTARI

INIZIO '800

1859

1968

LAMARCK

Teoria dell'uso e disuso

• Gli organismi si modificano usando o non usando certe parti del corpo
• Le caratteristiche acquisite si trasmettono ai discenti

Oggi sappiamo che non è corretta

darwin

selezione naturale

• In natura esiste variazione tra gli individui

Quelli più adatti all'ambiente sopravvivono e si riproducono'

neodarwinismo

SLe variazioni derivano da mutazioni casuali

Teoria accettata oggi

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