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18_Fossils_Dating_Timeline

18_Fossils_Dating_Timeline - Histor Historyoflife Today...

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Histor of life History of life T d ti Today’s questions: I “M l i I. “Macroevolution” II. Studying evolution’s Greatest Hits: The importance of corroborating evidence from independent sources of data
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I. “Macroevolution” Microevolution = evolutionary change within populations Macroevolution = evolutionary change between populations
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II. Studying evolution’s Greatest Hits: The importance of corroborating evidence from independent sources of data Case studies: Vascular tissue in plants Cambrian explosion (origin of major animal lineages) Hominins The flower … many others Tetrapod limb T t d i h l ti f ( tl ) l d d lli Tetrapoda is a monophyletic group of (mostly) land dwelling vertebrates: amphibians, snakes/lizards, turtles, crocs, birds, mammals
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The basic form of the tetrapod limb: H h i h d li b l d f h fi f l b Hypothesis: the tetrapod limb evolved from the fins of lobe finned fish that lived ~370 million years ago
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Fossil limbs from lobe finned fish and early tetrapods Which have the basic tetrapod limb pattern?
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