EVOLUTION. EVOLUTION : change of a species over time Individuals do not evolve; individuals grow and develop Acquired traits are not passed on to offspring.

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Presentation transcript:

EVOLUTION

EVOLUTION : change of a species over time Individuals do not evolve; individuals grow and develop Acquired traits are not passed on to offspring Natural selection is a process that can lead to evolution

EVOLUTION : change of a species over time Individuals do not evolve Acquired traits are not passed on to offspring Natural selection is a process that can lead to evolution - a species evolves a trait only if it provides an increase in fitness

EVOLUTION : change of a species over time Individuals do not evolve Acquired traits are not passed on to offspring Natural selection is a process that can lead to evolution - a species evolves a trait only if it provides an increase in fitness - variation continues without a selective force

VESTIGIAL STRUCTURES : structures that have no function and no longer serve a purpose to the organism - “residual” structures

HOMOLOGOUS STRUCTURES : structures from different organisms that have different mature forms but develop from the same embryonic tissues Provides evidence of common ancestry

HUMAN FOREARM CAT LEG

phylogenetic tree; a branching diagram showing the evolutionary relationships among organisms CLADOGRAMS

Modern Organisms Extinct Organisms Common Ancestors gavenche

VERTEBRAE = SPINE

JAWS TETRAPOD, LUNGS AMNIOTIC EGG MAMMALS