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Evidence of Evolution

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Evidence of Evolution Four clues support the theory of evolution Fossil Evidence Fossils allow scientists to show how species have changed over time. – PowerPoint PPT presentation

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Title: Evidence of Evolution


1
Evidence of Evolution
2
Four clues support the theory of evolution
3
Fossil Evidence
  • Fossils allow scientists to show how species have
    changed over time.

Fossil of a dinosaur with feathers-an ancestor of
modern birds
4
We can trace animal evolution by looking at how
the fossils change.
5
Types of fossils
  • Frozen in ice, trapped in amber, petrified, cast
    and imprint fossils.

These fossilized human footprints are 3.5 million
years old
6
What type of rock would most likely have fossils
in it?
7
Why arent fossils enough evidence?
Heck, this was back before we even had bodies!
Peter Look- weve got ancestors!
Finally! Proof of Evolution!
8
2. Anatomy
  • Matching or extra/left over body parts support
    the idea of common ancestors

9
2. Anatomy
  • Homologous structures body parts that are the
    same or similar in different species

10
2. Anatomy
  • Vestigial structures body parts that are useless
    or left over from a previous ancestor in which
    they were useful
  • Example Appendix, tailbones, goose bumps and
    wisdom teeth.

11
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12
3. Embryology
  • Many organisms have similar embryos, supporting
    the idea of common ancestors.

http//www.the-scientist.com/?articles.view/articl
eNo/35052/title/Dinosaur-Embryo-Graveyard/
13
(No Transcript)
14
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.

15
Chromosome 2 is split into 2 separate
chromosomes in chimps, but when combined, they
look just like our 2
Humans and chimps have 96 similar DNA. Chimps
have 48 chromosomes compared to humans 46.
16
Human Fossil Evidence Found
http//abcnews.go.com/Technology/ardi-fossil-bring
s-us-closer-common-ancestor-humans/story?id871635
9
Click for a news story on new human fossils found
17
Quiz
  • What are the four pieces of evidence supporting
    the theory of evolution?
  • Fossils, Anatomy, Embryology, Biochemistry

18
Quiz
  • What homologous structure do humans share with a
    cat?
  • Similar skeletons

19
Quiz
  • Name two vestigial structures that humans have.
  • Appendix, body hair, tail bones, goose bumps, ear
    muscles, wisdom teeth, etc.

20
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.

21
Homework
  • Use Chapter 6, section 2 (starts on 165) to
    complete the sentences on your worksheet.
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