Evidence of Evolution

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Evidence of Evolution
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Four clues support the theory of evolution
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Fossil Evidence

• Fossils allow scientists to show how species have
  changed over time.

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Fossils are used by scientists to understand how
camels evolved.
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Types of fossils

• Frozen in ice, trapped in amber, petrified, cast
  and imprint fossils.

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2. Anatomy

• Homologous structures (similar) support the idea
  of common ancestors.
• Example Arm bones

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2. Anatomy (cont.)

• Vestigial structures (left over body parts) also
  support the idea of common ancestors.
• Example Appendix, tailbones, goose bumps and
  wisdom teeth.

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3. Embryology

• Many organisms have similar embryos, supporting
  the idea of common ancestors.

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(No Transcript)
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4. Biochemistry

• Many organisms contain similar sequences
  (sections) of DNA.
• Small mutations or changes in the DNA eventually
  lead to the evolution of new species.

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Humans and chimps have 98.8 similar DNA. Chimps
have 48 chromosomes compared to humans 46.
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http//abcnews.go.com/Technology/ardi-fossil-bring
s-us-closer-common-ancestor-humans/story?id871635
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Quiz

• What are the four pieces of evidence supporting
  the theory of evolution?
• Fossils, Anatomy, Embryology, Biochemistry

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Quiz

• What homologous structure do humans share with a
  cat?
• Similar skeletons

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Quiz

• Name two vestigial structures that humans have.
• Appendix, body hair, tail bones, goose bumps, ear
  muscles, wisdom teeth, etc.

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Quiz

• What is more closely related a human and a pig
  or a human and a fish? Why?
• Human and a pig, we share more homologous
  structures, more DNA in common, and our embryos
  are more similar.