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Evolution

What is it? What evidence is there to support it?. Evolution. Think about it. Earth has millions of different kinds of organisms of every imaginable shape, size, and habitat. The variety of living things is called ________________. How did all these different organisms arise?

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Evolution

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  1. What is it? What evidence is there to support it? Evolution

  2. Think about it Earth has millions of different kinds of organisms of every imaginable shape, size, and habitat. The variety of living things is called ________________. • How did all these different organisms arise? • How are they related? biological diversity

  3. Evolution • Explains the diversity of organisms on Earth • It is change over time Do organisms evolve? NO! Populations do

  4. What is the evidence for evolution? • Paleontology

  5. What is Paleontology? • Study of Fossils • Evidence of living things from long ago • Body fossils • Trace fossils

  6. Body Fossils Ammonite Fern return

  7. Trace Fossils Tracks Coprolites

  8. What is the evidence for evolution? • Paleontology • Comparative Anatomy and Physiology

  9. Comparative Anatomy and Physiology • Vestigial Structures • Transitional Species • Homologous Structures

  10. Vestigial Structures Dogs & Dew claws Eye sockets & Blind Cave fish return

  11. Transitional Species Archaeopteryx Tiktaalik

  12. Something to think about… Are there any extant organisms that have traits of one group of animals and traits from another? Yes!

  13. Behold the Platypus! This animal is classified as a mammal however it has many reptilian traits Lays eggs Has a bill Has a poisonous spur Sensory organs on bill similar to that of a crocodile return

  14. Homologous Structures

  15. What is the evidence for evolution? • Paleontology • Comparative Anatomy and Physiology • Embryology and Molecular Biology

  16. Embryology • Hypothesis: • If animals share a common ancestry then it will be reflected in their development

  17. Developmental Patterns • Homeobox (Hox) genes are responsible for “telling” the embryo to develop certain features; eyes, arms, wings, legs, fins, etc.

  18. Whale and Dolphin Embryo with… Hind limbs!

  19. Hind Limbs expressed!

  20. What is the evidence for evolution? • Paleontology • Comparative Anatomy and Physiology • Embryology • Biogeography

  21. Biogeography • The distribution of similar plants and animals around the planet suggests that their environments drove the evolution of species that are similar

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