copyright cmassengale Evolution Diversity of Life copyright cmassengale
copyright cmassengale
Darwin’s Voyage of Discovery A reconstruction of the HMS Beagle sailing off Patagonia. copyright cmassengale
copyright cmassengale HMS Beagle’s Voyage copyright cmassengale
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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 copyright cmassengale
Terminal bud Lateral buds Cabbage Brussels sprouts Leaves Flower clusters Cauliflower Kale Flowers and stems Stem Broccoli Wild mustard Kohlrabi
LE 22-11 A flower mantid in Malaysia A stick mantid in Africa
Evidence for Evolution copyright cmassengale
copyright cmassengale 1 Homologous Structures copyright cmassengale
copyright cmassengale Evidence for Evolution - Comparative Embryology 2. Similarities In Embryonic Development copyright cmassengale
copyright cmassengale Human Fetus – 5 weeks copyright cmassengale
copyright cmassengale Chicken Turtle Rat copyright cmassengale
3. Similarities in DNA Sequence copyright cmassengale
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.
#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.
#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
NORTH AMERICA AUSTRALIA LE 22-17 NORTH AMERICA Sugar glider AUSTRALIA Flying squirrel
#5 Comparative Anatomy Analogous structures are similar in function but differ in structure Analogous structures DO NOT show common ancestry Fly wing Bat wing
Pythons have tiny femurs (leg bone)