Major Transitions in Evolution

Course Overview

Join two brilliant and engaging professors on an amazing exploration of evolution’s most important moments—the giant leaps that gave rise to nature’s boundless diversity.

Course No. 1518

Imagine a world without bees, butterflies, and flowering plants. That was Earth 125 million years ago. This course, taught by paleontologist Anthony Martin and paleoanthropologist John Hawks, takes you through Earth’s major evolutionary transitions—from the first complex cells to modern humans—revealing how life transformed over billions of years.

Key topics include:

• The origins of multicellular life
• The rise of vertebrates and colonization of land
• The evolution of dinosaurs, birds, and mammals
• Human ancestry and accelerating genetic changes

Video Lectures

Module 1: Foundations of Macroevolution

1. Macroevolution and Major Transitions (33 min)
   Introduction to macroevolution and key transitions in life’s history.
2. Paleontology and Geologic Time (31 min)
   How fossils and radiometric dating reveal Earth’s deep history.
3. Single-Celled Life: Prokaryotes to Eukaryotes (28 min)
   The leap from simple to complex cells in the Proterozoic eon.
4. Metazoans: The Earliest Multicellular Animals (27 min)
   The first animals and their shallow-marine ecosystems.

Module 2: Vertebrates and Land Colonization

5. The Development of Skeletons (29 min)
   How predator-prey “arms races” drove skeletal evolution.
6. The Rise of Vertebrates (29 min)
   From eel-like conodonts to fish, amphibians, and mammals.
7. Colonization of the Land (33 min)
   Life adapts to barren terrestrial environments.
8. Origins of Insects and Powered Flight (30 min)
   The Devonian period’s insect revolution.

Module 3: Plants, Reptiles, and Dinosaurs

9. Seed Plants and the First Forests (34 min)
   How seed ferns formed Earth’s earliest forests.
10. From Fish to 4-Limbed Animals (29 min)
    The evolution of tetrapods from lobe-finned fish.
11. The Egg Came First: Early Reptile Evolution (30 min)
    How amniotic eggs enabled reptiles to thrive on land.
12. The Origins and Successes of the Dinosaurs (29 min)
    Small reptiles evolve into Mesozoic giants.

Module 4: Birds, Mammals, and Primates

13. Marine and Flying Reptiles (28 min)
    Ichthyosaurs, plesiosaurs, and pterosaurs rule sea and sky.
14. Birds: The Dinosaurs Among Us (31 min)
    Theropod dinosaurs transition into birds.
15. The First Flowers and Pollinator Coevolution (33 min)
    How flowering plants and pollinators shaped ecosystems.
16. Egg to Placenta: Early Mammal Evolution (31 min)
    Mammals survive extinction and diversify.

Module 5: Human Evolution

17. From Land to Sea: The Evolution of Whales (29 min)
    How mammals returned to the ocean.
18. Moving on Up: The First Primates (32 min)
    Primate adaptations for forest canopies.
19. Apes: Swinging Down from the Trees (32 min)
    The lineage leading to modern humans.
20. From 4 Legs to 2: The Hominin Radiation (31 min)
    Bipedalism and early hominins like Australopithecus.

Module 6: Modern Humans and Reflections

21. First Humans: Toolmakers and Hunter-Gatherers (32 min)
    Stone tools and early human cognition.
22. From Homo to sapiens: Talking and Thinking (32 min)
    Human dispersal and Neanderthal interactions.
23. Our Accelerating Evolution (32 min)
    Genetic changes in the last 10,000 years.
24. Reflections on Major Transitions (33 min)
    Professors Martin and Hawks discuss evolutionary themes