Week 10, Lecture 3, Macroevolution

Week 10, Lecture 3, Macroevolution - Macroevolution 1)Types...

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1 Lajoie – Macroevolution ‘09 Macroevolution • Evolution of higher taxa (genera, families, orders, etc. ) • A result of microevolution (speciation) • Evolutionary history of groups? (phylogeny) • Lineages from ancestral lines? (tree diagrams) 1) Types of evidence 2) Phylogenetic trees 3) Mechanisms 4) Major patterns 1)Types of evidence 2) Phylogenetic trees 3) Mechanisms 4) Major patterns Lajoie – Macroevolution ‘09 1) Types of evidence Fossil record • 99% of all species are extinct • biased toward common, hard-bodied species • relative dating (sediment deposits) • absolute dating - C 14 half life 5,600 years ( N) 1) Types of evidence 2) Phylogenetic trees 3) Mechanisms 4) Major patterns Fossil record Comparative morphology Molecular data K 40 half life 1.3 billion years ( Ar) U 238 half life 5 billion years ( Pb) Rb 87 half life of 48.4 billion years ( Sr) Lajoie – Macroevolution ‘09 Comparative morphology Identify structures from common ancestors homologous - from the same ancestral and embryological origin. e.g. legs and wings analogous - same function but from different ancestry and embryology. e.g. wings of birds and insects 1) Types of evidence 2) Phylogenetic trees 3) Mechanisms 4) Major patterns Fossil record Comparative morphology Molecular data Lajoie – Macroevolution ‘09 Don’t get fooled Homologous - from the same ancestral and embryological origin. 1) Types of evidence
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Spring '09 term at UWO.

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Week 10, Lecture 3, Macroevolution - Macroevolution 1)Types...

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