Ideas that shaped Darwin’s thinking

Prior to Darwin’s Theory of Evolution there were 4 scientists that had their own ideas and theory’s

1. Hutton 2.Lyell3.Lamarck4. Malthus

The Rock Boys!!

The Math guy!

Helped scientists understand that Earth is many millions of years old

Processes that changed the Earth in the past are the same processes that operate in the present

In Lyell’s book: Principles of Geology

Rock Cycle: Volcanoes and Earthquakes

Erosion continues to carve out canyons.

Uniformitarianism: the natural laws and processes that operate in the universe now, have always operated in the past.

UniformitarianismHow do you pronounce that??

Use or disuse of organs, organisms acquired or lost certain traits during their lifetime.

Traits could then be passed on to their offspring.

Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone.

Do you remember: Density Independent factors Density dependent factors

He theorized that there was a “carrying capacity” in every habitat/ environment

Populations will naturally get checked by famine, disease etc.

1. Change over time, common ancestor Pre-existing variation

2. Variation within a population or species Everyone is just a little different

3. Natural selection Survival of the fittest

1. Fossil Record

2. Geographical Distribution

3. Similarities in Structure Homologous/Analogous Structures

4. Vestigial organs

5. Similarities in Early development Embryology

Yes, I can support it!

Preserved remains or markings left by organisms that lived in the past are called fossils.

Position of fossils can reveal their age.

Younger

Older

Organisms in different parts of the world shared similarities

Homologous structure: same basic structure but different function

Analogous structure: same basic function, but do not have the same basic structure

Homologous structures: similar structures but have different function

Derived from a common ancestor

Ex. Forelimb

Analogous structures: similar function but not similar in structure

Not derived from a common ancestor

Ex. A butterfly wing and a bird wing

Organs of many animals are so reduced in size that they are just vestiges, or traces, of homologous organs in other species

I have toe nails!!!

Common pattern in the development In their early stages, chickens,

turtles, and rats look similar, providing evidence that they shared a common ancestor

Adopt an Embryo!

Select one embryo to adopt as your own!!

Adopt an Embryo!

1 2 3 4 5 6 7 8

Stage 2

1 2 3 4 5 6 7 8

Stage 3

1. Fossil Record

2. Geographical Distribution

3. Similarities in Structure Homologous/Analogous Structures

4. Vestigial organs

5. Similarities in Early development Embryology

Yes, I can prove it!

HOMOLOGOUS STRUCTURE

Same Structure different function

ANALOGOUS STRUCTURE

Same function different structure

Instructions:1.Read2.Define3.Color4.Chart5.Answer Questions