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Evolution - PowerPoint PPT Presentation


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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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Presentation Transcript
think about it
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

evolution
Evolution
  • Explains the diversity of organisms on Earth
  • It is change over time

Do organisms evolve?

NO!

Populations do

what is paleontology
What is Paleontology?
  • Study of Fossils
    • Evidence of living things from long ago
      • Body fossils
      • Trace fossils
body fossils
Body Fossils

Ammonite

Fern

return

trace fossils
Trace Fossils

Tracks

Coprolites

what is the evidence for evolution1
What is the evidence for evolution?
  • Paleontology
  • Comparative Anatomy and Physiology
comparative anatomy and physiology
Comparative Anatomy and Physiology
  • Vestigial Structures
  • Transitional Species
  • Homologous Structures
vestigial structures
Vestigial Structures

Dogs & Dew claws

Eye sockets & Blind Cave fish

return

transitional species
Transitional Species

Archaeopteryx

Tiktaalik

something to think about
Something to think about…

Are there any extant organisms that have traits of one group of animals and traits from another?

Yes!

behold the platypus
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

what is the evidence for evolution2
What is the evidence for evolution?
  • Paleontology
  • Comparative Anatomy and Physiology
  • Embryology and Molecular Biology
embryology
Embryology
  • Hypothesis:
    • If animals share a common ancestry then it will be reflected in their development
developmental patterns
Developmental Patterns
  • Homeobox (Hox) genes are responsible for “telling” the embryo to develop certain features; eyes, arms, wings, legs, fins, etc.
what is the evidence for evolution3
What is the evidence for evolution?
  • Paleontology
  • Comparative Anatomy and Physiology
  • Embryology
  • Biogeography
biogeography
Biogeography
  • The distribution of similar plants and animals around the planet suggests that their environments drove the evolution of species that are similar