Title: Evidence of Evolution
1Evidence of Evolution
2Four clues support the theory of evolution
3Fossil Evidence
- Fossils allow scientists to show how species have
changed over time.
Fossil of a dinosaur with feathers-an ancestor of
modern birds
4We can trace animal evolution by looking at how
the fossils change.
5Types of fossils
- Frozen in ice, trapped in amber, petrified, cast
and imprint fossils.
These fossilized human footprints are 3.5 million
years old
6What type of rock would most likely have fossils
in it?
7Why arent fossils enough evidence?
Heck, this was back before we even had bodies!
Peter Look- weve got ancestors!
Finally! Proof of Evolution!
82. Anatomy
- Matching or extra/left over body parts support
the idea of common ancestors
92. Anatomy
- Homologous structures body parts that are the
same or similar in different species
102. 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.
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123. 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/
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144. Biochemistry
- Many organisms contain similar sequences
(sections) of DNA. - Small mutations or changes in the DNA eventually
lead to the evolution of new species.
15Chromosome 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.
16Human 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
17Quiz
- What are the four pieces of evidence supporting
the theory of evolution? - Fossils, Anatomy, Embryology, Biochemistry
18Quiz
- What homologous structure do humans share with a
cat? - Similar skeletons
19Quiz
- Name two vestigial structures that humans have.
- Appendix, body hair, tail bones, goose bumps, ear
muscles, wisdom teeth, etc.
20Quiz
- 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.
21Homework
- Use Chapter 6, section 2 (starts on 165) to
complete the sentences on your worksheet.