Warm up: 1.Who is the scientist who provided evidence for evolution? 2.What is the definition for evolution? 3. What is a species?

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.