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How many moths can you see on this slide? Variation and Natural Selection To describe how Variation drives natural selection To explain how Variation can lead to extinction of less well adapted individuals. Natural selection • Within each species, the individuals with the variations best suited to the environment will survive better than the others. • They will survive to reproduce. • They pass on the genetic information for these variations to their offspring. • Species gradually evolve in this way. This process is called natural selection. Natural selection TO COPY Summary so far… Variation drives Natural selection • Variation exists between individuals of a species • Individuals in a species compete for • Food , shelter, mates • Those individuals who have better suited variations survive, reproduce and pass their genes on. • Individuals who are less well adapted, die Task! Card sort…. Your task! • What colour are most polar bears? Why are they this colour? • One in every 1000 births of polar bears has a mutation in the fur gene which leads to it being born with brown fur. Explain what would happen to this mutant polar bear. • Imagine it is 100 years into the future and the polar ice caps have melted. As a result there is little snow in the polar bear’s habitat. What would happen to the white bears? • Explain what would now happen to the mutant brown bears. • What colour would most polar bears be now? Polar Bears iscolour an example of natural selection: 1.This What are most polar bears. Why are they this colour? 2.Only One in every 1000 bears births ofbest polar bears hasto a mutation the polar suited their in the fur gene which leads to it being born with brown fur. Explain what environment willbear. survive to pass on would happen to(adapted) this mutant polar their genes. 3. Imagine it is 100 years into the future and the polar ice caps Because of the change environment, the have melted. As a result therein is the little snow in the polar bear’s habitat. Whathas would happen to the white bears? polar bear evolved. an animal doesnow not evolve it mutant is at risk ofbears. 4.If Explain what would happen to the brown becoming extinct. 5. What colour would most polar bears be now? Which side of the classroom would you go? Which side of the classroom would you go? Coral Snake King Snake