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Lec15_PP_S11 - Lecture 15 Natural Selection(Part 1 Natural...

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Lecture 15: Natural Selection (Part 1) Natural Selection : Proposed by Charles Darwin and Alfred Russel Wallace. Natural Selection : differential reproduction and survival of genetically determined forms. Natural selection and adaptations .
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Points About Natural Selection : 1. Evolution and natural selection are not synonyms. 2. Selection operates through the environment . 3. Adaptive vs. neutral variation. 4. Selection operates to better adapt populations to their environments. 5. The phenotype is the target of natural selection. Fitness : Fitness : a concept related to natural selection. Fitness (Adaptive Value) : reproductive contribution of a genotype to future generations. Relative fitness symbolized as w . Selection coefficient (s ) : the intensity of selection. s = 1 - w
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Components of Fitness : Fitness is multidimensional . Some components of fitness: 1. viability (zygotic) selection. 2. sexual selection. 3. fertility selection. Calculating Fitness Values :
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Calculating Fitness Values : Convert absolute fitness values to relative fitness
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