AP Biology · Unit 7: Natural Selection
7.2 Natural Selection
In short
You must understand that natural selection acts on phenotypic variations within populations, and that changing environments apply selective pressures. You need to know that specific phenotypic variations can increase or decrease an organism's fitness depending on the environment. Furthermore, you must connect variation at the molecular level (such as the number and types of molecules within cells) to the organism's overall fitness, survival, and reproduction.
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What else do you need to know about Natural Selection?
Illustrative examples include flowering time in relation to global climate change, sickle cell anemia, and DDT resistance in insects.
How is Natural Selection tested on the exam?
Exam questions often require you to explain biological concepts and processes (Skill 1.B). When writing about evolution, you must be precise and avoid Lamarckian statements. A common pitfall is using buzzwords like 'fitness' without explaining the underlying concept. You must clearly articulate that while natural selection acts on individuals, it is populations that evolve.
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Natural Selection: common questions
What do you need to know about Natural Selection for AP Biology?
You must understand that natural selection acts on phenotypic variations within populations, and that changing environments apply selective pressures. You need to know that specific phenotypic variations can increase or decrease an organism's fitness depending on the environment. Furthermore, you must connect variation at the molecular level (such as the number and types of molecules within cells) to the organism's overall fitness, survival, and reproduction.
How is Natural Selection tested on the AP Biology exam?
Exam questions often require you to explain biological concepts and processes (Skill 1.B). When writing about evolution, you must be precise and avoid Lamarckian statements. A common pitfall is using buzzwords like 'fitness' without explaining the underlying concept.
Where does Natural Selection fit in AP Biology?
Natural Selection is topic 7.2 in Unit 7: Natural Selection of AP Biology.
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