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Evolution
Diversity of Life
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3. Darwin’s Voyage of Discovery
A reconstruction of the HMS Beagle sailing off Patagonia.
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HMS Beagle’s Voyage
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6. Common Descent with Modification
Darwin proposed that organisms descended from common ancestors
Idea that organisms change with time, diverging from a common form
Caused evolution of new species
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7. Terminal bud Lateral buds Cabbage Brussels sprouts Leaves Flower
clusters
Cauliflower
Kale
Flowers
and
stems
Stem
Broccoli
Wild mustard
Kohlrabi

8. LE 22-11
A flower mantid
in Malaysia
A stick mantid
in Africa

9. Evidence for Evolution
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1 Homologous Structures
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Evidence for Evolution - Comparative Embryology 2.
Similarities In Embryonic Development
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Human Fetus – 5 weeks
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Chicken
Turtle
Rat
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14. 3. Similarities in DNA Sequence
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15. AKA Biochemical Evidence
Two closely-related organisms will have similar DNA, RNA, and protein (amino acid) sequences.
This also gives evidence of a common ancestor.

17. #4. Fossil Evidence Fossils Earth is Millions of years old!
Fossils in older layers are more primitive than those in the upper layers.
Extinct Fossils resemble modern animals.
This shows a common ancestry.

18. #5 Geographical Distribution
Geography & environment gives evidence for evolution
Island species most closely resemble nearest mainland species
Populations can show variation from one island to another

19. NORTH AMERICA AUSTRALIA
LE 22-17
NORTH
AMERICA
Sugar
glider
AUSTRALIA
Flying
squirrel

20. #5 Comparative Anatomy
Analogous structures are similar in function but differ in structure
Analogous structures DO NOT show common ancestry
Fly wing
Bat wing

21. Pythons have tiny femurs (leg bone)