warm up: 1.who is the scientist who provided evidence for evolution? 2.what is the definition for...
Post on 13-Jan-2016
214 Views
Preview:
TRANSCRIPT
Warm up:
1.Who is the scientist who provided
evidence for evolution?
2.What is the definition for
evolution?
3. What is a species?
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)
Word Definition Picture
1. Fossils Solidified remains or imprints of once-living organisms
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
Plant fossils
Fossilized skin
Ancient mosquito preserved in amber
Which fossil is the oldest and why?
A
B
C
Evidence?Evidence? What is it?What is it? PicturePicture
2. Ancestor
Early form of an organism from which
later forms are descended from
Evidence?Evidence? What is it?What is it? PicturePicture
3. Extinct
When a group of organisms die out and none are left!
Word Definition Picture
4. Vestigial Structures
A body structure that is no longer used and is used as evidence for
evolution
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
Evidence?Evidence? What is it?What is it? PicturePicture
5. Homologous structures
Many bones in arms, legs, flippers, and
wings are very similar.
Evidence?Evidence? What is it?What is it? PicturePicture
6. Similar DNA
All organisms have DNA and organisms that
look similar have very similar DNA.
Similarities in DNASimilarities in DNA
Example: elephant shrew (rodent) and elephant – DNA proved that the shrew is closer related to elephant than to mice
Evidence?Evidence? What is it?What is it? PicturePicture
7. Similar Embryonic Structures
Before organisms are born, many look very similar.
Similarities in Early DevelopmentSimilarities in Early Development
1. Adults of different species look very different
2. Similarities in the shapes and structures when an embryo is in early development
Dolphin embryo
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
Closure activity - Fold your Closure activity - Fold your paper into 6 strips.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. Use your notes to help you.
top related