Descent with Modification – A Darwinian View of Life

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Descent with Modification – A Darwinian View of Life Chapter 22 Descent with Modification – A Darwinian View of Life

Endless Forms Most Beautiful African beetles beat the heat in the Sahara desert - BBC wildlife https://www.youtube.com/watch?v=XsMJNNshPOs

Key Observations About Life 1. the striking ways in which organisms are suited for life in their environments 2. the many shared characteristics of life 3. the rich diversity of life

Evolution Descent with modification A change in the genetic composition of a population form generation to generation

The Darwinian revolution challenged traditional views of a young Earth inhabited by unchanging species Aristotle(384-322B.C.) – “scale of nature” Each form perfect and permanent Coincided with ideas from the Old Testament

1700’s Carolus Linnaeus – nested classification system and binomial system of naming

Ideas About Change over Time Paleontology – study of fossils

Catastrophism

Uniformitarianism

Lamarck’s Hypothesis of Evolution Fossil evidence  Life was not fixed Life evolves as environment changes Mechanisms explaining how evolution occurs

Descent with modification by natural selection explains the adaptations of organisms and the unity and diversity of life Galapagos Finches – Could new species arise from an ancestral form by the gradual accumulation of adaptations to a different environment? Natural selection – a process in which individuals with certain inherited traits leave more offspring than individuals with other traits

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