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lecture 5 - Swinging in the Tree of Life Unity Diversity of...

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1 Swinging in the Tree of Life Tree of Life by Gustav Klimt (1909) – www.artinthepicture.com 2 Unity & Diversity of Life Organisms exploit many physiochemical processes Spontaneous reactions – produce order at the expense of universal disorder Moderately stable information storage – allows adaptation Use diffusion along gradients – evolve transport systems where diffusion ineffective History matters! – innovations produced by early life forms retained & enhanced in more advanced organisms 3 Unity & Diversity of Life Darwin – organisms related to each other in complex ‘tree of life’ www.wikipedia.com 4 Phylogenies Representations of relationships between organisms Understand underlying unity of life Provide insights into evolutionary innovations Based on types of similarities between species Primitive similarity Convergent similarity Derived similarity
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5 Similarity Primitive similarity Single origin in distant ancestor – does no imply close relationship • Homologous structures – e.g., amniotic egg in birds (Fig. 33.17) & mammals (Fig.
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