Concepts | Questions | Media Resources |
17.1 History of Evolutionary Thought
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- Evolution has two aspects: descent from a common ancestor and adaptation to the environment.
- In the eighteenth century, scientists became especially interested in classifying and understanding the relationship among all the many forms of present and past life.
- Gradually, in the eighteenth century, scientists began to gather evidence and accept the idea that life forms do change over time. Explanations for change varied.
| - What did Darwin mean by the statement "descent with modification"?
Answer - What is the inheritance of acquired characteristics and why has this hypothesis been rejected?
Answer
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Essential Study Partner
Summaries of major points:- Darwin's voyage
- Mid-eighteenth century contributions
- Late eighteenth century contributions
Art Review
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17.2 Darwin's Theory of Evolution
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- Charles Darwin's trip around the southern hemisphere aboard the HMS Beagle provided him with evidence that the earth is very old and that evolution does occur.
- Both Darwin and Alfred Wallace proposed natural selection as a mechanism by which adaptation to the environment takes place. This mechanism is consistent with our present-day knowledge of genetics.
| - What affect did the geologic age of the earth (as proposed in Charles Lyell's book) have on Darwin's thinking?
Answer - What is biogeography?
Answer - Describe natural selection.
Answer - True or False: Natural selection results in a population perfectly adapted to its environment.
Answer - Natural selection acts on the ____________ (phenotype or genotype) of an individual, but alters the _______________ (phenotype or genotype) of the population.
Answer - Define fitness and explain what it means to be relative.
Answer
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Essential Study Partner
Summaries of major points:- Darwin's background
- Geology and fossils
- Biogeography
- Natural selection and adaptation
- Organisms have variations
- Organisms struggle to exist
- Organisms differ in fitness
- Organisms become adapted
- 'On Origin of Species' by Darwin
Art Review
General Biology Weblinks
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17.3 Evidence for Evolution
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- The fossil record, biogeography, comparative anatomy, and comparative biochemistry support a hypothesis of common descent.
| - How does the fossil record support the theory of evolution?
Answer - What is the difference between homologous and analogous structures?
Answer
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Essential Study Partner
Summaries of major points:- Common descent adapted
- Fossil evidence
- Biogeographical evidence
- Anatomical evidence
- Biochemical evidence
- Because it is supported by so many lines of evidence, evolution is no longer considered a hypothesis
Art Review
Art Quizzes
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