5.03 evolution evidence
TRANSCRIPT
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Do Now:
1.Who is the scientist who provided
evidence for evolution?
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EvolutionEvolutionObjective:Objective:
•You will be able to state the types of evidence You will be able to state the types of evidence supporting evolution.supporting evolution.
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EVIDENCE FOR EVOLUTIONEVIDENCE FOR EVOLUTION
1. Fossils in the fossil record
2. Vestigial Structures
3. Similar skeletal structures (bones)
4. Similar DNA
5. Similar embryonic structures (before born)
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Word Definition Picture
1. Fossils Solidified remains or imprints of once-living organisms
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How does a fossil form?How does a fossil form?
Fossil is exposed
Covered by sediment
Minerals replace remains
Minerals still replacing remains, layers disturbed
Organism dies
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Plant fossils
Fossilized skin
Ancient mosquito preserved in amber
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Which fossil is the oldest and why?
A
B
C
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Evidence?Evidence? What is it?What is it? PicturePicture
2. Ancestor
Early form of an organism from which
later forms are descended from
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Evidence?Evidence? What is it?What is it? PicturePicture
3. Extinct
When a group of organisms die out and none are left!
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Word Definition Picture
4. Vestigial Structures
A body structure that is no longer used and is used as evidence for
evolution
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Evidence?Evidence? What is it?What is it? PicturePicture
Vestigial Structures
Show that they evolved from needing them.
Examples: leg bones in whales and the human tail
bone
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Evidence?Evidence? What is it?What is it? PicturePicture
5. Similar skeletal structures
Many bones in arms, legs, flippers, and
wings are very similar.
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Evidence?Evidence? What is it?What is it? PicturePicture
4. Similar DNA
All organisms have DNA and organisms that
look similar have very similar DNA.
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Similarities in DNASimilarities in DNA
Example: elephant shrew (rodent) and elephant – DNA proved that the shrew is closer related to elephant than to mice
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Evidence?Evidence? What is it?What is it? PicturePicture
7. Similar Embryonic Structures
Before organisms are born, many look very similar.
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Similarities in Early DevelopmentSimilarities in Early Development
1. Adults of different species look very different
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2. Similarities in the shapes and structures when an embryo is in early development
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Dolphin embryo
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Is evolution happening now?Is evolution happening now?
Yes, scientists have observed many examples of species changing today:
• People are getting larger
• Peppered moths have changed color
• Bacteria are becoming resistant to drugs
• Insect pests become immune to poisons
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AssignmentAssignment• Make up a creative newspaper article that
includes all 5 types of evidence for evolution. Include at least one picture.
• Sample evolution article ideas (pick one if you can’t come up with your own idea!):– An evolution professor comes to Liberty to talk about
the evidence for evolution (what will he talk about?)– A new fossil is found and then used as evidence for
evolution (what other types of evidence is there?)– A new movie has come out and it’s about evolution
(what types of evidence does it talk about?)
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AssignmentAssignment• Create a collage explaining evolution and the 5
different types of evidence for it.• EXAMPLE: fossils
Similarbones
Vestigial Structures
Similar Embryo Development
Similar DNA
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Fold your paper into 6 strips.Fold your paper into 6 strips.
• Label the first box “Evidence for Evolution”
• List each of the 5 types of evidence in the other boxes.
• Draw a picture for each type of evidence.