Presentation on theme: "15.2 – Ideas That Shaped Darwin’s Thinking"— Presentation transcript: 1 15.2 – Ideas That Shaped Darwin’s Thinking Show
2 Interest Grabber My, How You’ve Changed! 3 Darwin’s Ideas Darwin greatly changed the thinking of many scientists, but also many did not
believe him Most Europeans at the time believed Earth was only created a few thousands of years before present time They believed everything was created the way it was and never changed By the time Darwin set sail there was a rich fossil record challenging this idea 4
Lamarck’s Theory of Evolution
5 Lamarck’s Examples 6 Lamarck’s Theory of Evolution
7 Objective: Summarize Lamarck’s theory of evolution through inheritance of acquired characteristics
8 Lamarck’s Theory His theory is incorrect in several ways 9 Population Growth In 1798, Thomas Malthus saw babies were being born
faster then people were dying He reasoned if that continues to happen the time might come when there is insufficient land and food on Earth to support the population size Does this apply to all living organisms? Darwin realized this reasoning applied even more strongly to plants and animals than it did to humans. Humans produce far fewer offspring The overwhelming majority of a species’ offspring die Presentation on theme: "15.2 – Ideas That Shaped Darwin’s Thinking"— Presentation transcript: 1 15.2 – Ideas That Shaped Darwin’s Thinking
2 Darwin’s Ideas Darwin greatly changed the thinking of many scientists, but also many did not believe him Most Europeans at the time believed
Earth was only created a few thousands of years before present time They believed everything was created the way it was and never changed By the time Darwin set sail there was a rich fossil record challenging this idea 3 Lamarck’s Theory of
Evolution
4 Lamarck’s Examples 5 Lamarck’s Theory of Evolution 6 Lamarck’s Theory His theory is incorrect in several ways 7 Population Growth In 1798, Thomas Malthus saw babies were being born faster then people were dying He reasoned if that
continues to happen the time might come when there is insufficient land and food on Earth to support the population size Does this apply to all living organisms? Whose ideas shaped Darwin's thinking?Thomas Malthus was arguably the person who was most influential to Darwin. Even though Malthus was not a scientist, he was an economist and understood populations and how they grow. Darwin was fascinated by the idea that the human population was growing faster than food production could sustain.
Who is one of the first scientist to recognize that living things have changed over time?The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.
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