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Lecture

Chapter 25 – Macroevolution.docx

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Department
Biology
Course
BIOL 226
Professor
Jim Grant
Semester
Fall

Description
Chapter 25 – Macroevolution Eras are defined by: • Mass extinctions • Followed by radiation of new forms Mass Extinction • Part of our evolutionary history • 5 big mass extinctions o Cretaceous o Triassic­Jurassic o Permian o Devonian o Ordovician Permian extinction: • 250 million BP • 96% of marine animal species became extinct. • Duration: 0.5 million years • Cause:  o Volcanoes o Global warming (6C) o Ocean anoxia Cretaceous Extinction: • 65 million BP • Dinosaurs: extinct • ½ marine animal species • Cause: Meteor What is macroevolution? • Broad patterns of evolution above the species level. • Microevolution + speciation + extinctions + adaptive radiations How is a new phylum created? A new phylum is created by speciation and by waiting a lot of time. Chapter 26 
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