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Transcript
Natural Selection (15.3) State Standard SB5D. Relate natural selection to changes in organisms Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Natural Selection Nature acts to select the individuals that are best ____________ for survival and reproduction in a particular ____________ Chapter 15 Evolution Principles of Natural Selection Natural selection takes place when… Individuals in the population show ____________. The variations are ____________. Members of the population have more offspring than can survive on available resources (____________). Variations that increase reproductive ____________ have a greater chance of being ____________ on. 15.3 Natural Selection-Speciation-Resistance • Industrialization & the peppered moths Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance ____________ selection operates to ____________ ____________ expressions of a trait when the average expression leads to higher fitness. Ex: Peppered Moths before the Industrial Revolution Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance ____________ selection makes an organism more fit by selecting ____________ ____________ ____________. Ex: Pollution from the Industrial Revolution caused directional selection in the peppered moths. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance ____________ selection is a process that ____________ a population into two groups. Ex: Different rock types in the same biome will favor different coat varieties of these mice Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance ____________ selection operates in populations where males and females ____________ significantly in appearance. Qualities of sexual attractiveness appear to be the ____________ of qualities that might enhance survival. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Adaptive Radiation – AKA Divergent Evolution/Speciation Can occur in a relatively short time when one species gives rise to many different species in response to the creation of ____________ ____________ or some other ecological opportunity Chapter 15 Evolution 15.3 Natural Selection-SpeciationResistance Coevolution The relationship between two species might be so close that the evolution of one species ____________ the evolution of the other species. Associated with ____________ Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Convergent Evolution ____________ species evolve ____________ traits because of similar environmental pressures. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance Rate of Speciation Evolution proceeds in small, gradual steps according to a theory called ____________. ____________ ____________ explains rapid spurts of genetic change causing species to diverge quickly. Chapter 15 Evolution 15.3 Natural Selection-Speciation-Resistance