Unit 1 Darwin’s ways of working Darwin’s ways of working: Unit 1.
Ideas that shaped Darwin’s thinking. Prior to Darwin’s Theory of Evolution there were 4...
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![Page 1: 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.](https://reader035.fdocuments.in/reader035/viewer/2022062409/5697bfe91a28abf838cb696d/html5/thumbnails/1.jpg)
Ideas that shaped Darwin’s thinking
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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!
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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
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In Lyell’s book: Principles of Geology
Rock Cycle: Volcanoes and Earthquakes
Erosion continues to carve out canyons.
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Uniformitarianism: the natural laws and processes that operate in the universe now, have always operated in the past.
UniformitarianismHow do you pronounce that??
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Use or disuse of organs, organisms acquired or lost certain traits during their lifetime.
Traits could then be passed on to their offspring.
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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
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He theorized that there was a “carrying capacity” in every habitat/ environment
Populations will naturally get checked by famine, disease etc.
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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
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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!
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Preserved remains or markings left by organisms that lived in the past are called fossils.
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Position of fossils can reveal their age.
Younger
Older
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Organisms in different parts of the world shared similarities
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Homologous structure: same basic structure but different function
Analogous structure: same basic function, but do not have the same basic structure
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Homologous structures: similar structures but have different function
Derived from a common ancestor
Ex. Forelimb
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Analogous structures: similar function but not similar in structure
Not derived from a common ancestor
Ex. A butterfly wing and a bird wing
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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!!!
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Common pattern in the development In their early stages, chickens,
turtles, and rats look similar, providing evidence that they shared a common ancestor
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Adopt an Embryo!
Select one embryo to adopt as your own!!
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Adopt an Embryo!
1 2 3 4 5 6 7 8
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Stage 2
1 2 3 4 5 6 7 8
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Stage 3
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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!
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HOMOLOGOUS STRUCTURE
Same Structure different function
ANALOGOUS STRUCTURE
Same function different structure
Instructions:1.Read2.Define3.Color4.Chart5.Answer Questions