Chapter 22: Descent with Modification: A Darwinian View of Life. Chapter 22: Descent with Modification: A Darwinian View of Life. What do you know about evolution? What is evolution? Gradual change over time What is paleontology? Study of fossils
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HMS Beagle in port
Darwin in 1840,
after his return
Tierra del FuegoFigure 22.5 The voyage of HMS Beagle
(a) Cactus eater. Life The long,sharp beak of the cactusground finch (Geospizascandens) helps it tearand eat cactus flowersand pulp.
(c) Seed eater. The large groundfinch (Geospiza magnirostris)has a large beak adapted forcracking seeds that fall fromplants to the ground.
(b) Insect eater. The green warbler finch (Certhidea olivacea) uses itsnarrow, pointed beak to grasp insects.Figure 22.6 Beak variation in Galápagos finches
Millions of years ago
MoeritheriumFigure 22.7 Descent with modification
(a) A flower mantid Lifein Malaysia
(b) A stick mantidin AfricaFigure 22.11 Camouflage as an example of evolutionary adaptation
KohlrabiFigure 22.10 Artificial selection
WhaleFigure 22.14 Mammalian forelimbs: Homologous structures
Human embryoFigure 22.15 Anatomical similarities in vertebrate embryos
Identical to the Amino Acids in a
Human Hemoglobin Polypeptide
LampreyFigure 22.16 Comparison of a protein found in diverse vertebrates
squirrelFig. 22.17 Different geographic regions, different mammalian “brands”