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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 CLADOGRAMS phylogenetic tree; a branching diagram showing the evolutionary relationships among organisms Modern Organisms Extinct Organisms gavenche Common Ancestors VERTEBRAE = SPINE MAMMALS AMNIOTIC EGG TETRAPOD, LUNGS JAWS VERTEBRAE = SPINE
