B1.7 Evolution 0.0 / 5 ? BiologyEvolution, extinction and natural selectionGCSEAQA Created by: LauragreeenCreated on: 10-04-17 10:11 When do scientists think that life on Earth began? 3 billion years ago 1 of 16 What new ideas did Lamarck propose and how did he explain them? Individuals adapt & evolve to suit their environment - inheritance of acquired characteristics 2 of 16 What is Darwin's theory of natural selection based on? Species on islands developing to suit life there and being different 3 of 16 Why did it take a long time for Darwin's theories to be accepted? They challenged creation, and he didn't have enough evidence and couldn't prove HOW it happened 4 of 16 Why is reproduction a wasteful process? Animals and plants always produce more offspring than the environment can support 5 of 16 Explain in terms of genes how natural selection works The offspring with the best suited genes survive and breed successfully 6 of 16 What is a mutation and how do they occur? A new form of gene resulting from changes in existing ones after mistakes made in copying DNA when cells divide 7 of 16 How can mutations help a species survive? Occasionally they have a good effect and make a species better suited to its environment 8 of 16 What is classification? The organisation of living things into groups according to their similarities 9 of 16 What is the system used to classify all living things? The natural classification system 10 of 16 What are the biggest groups of the natural classification system? Give 2 examples Kingdoms e.g. plant, animal 11 of 16 What is the smallest group of the natural classification system? Species 12 of 16 What is the main way we identify an organism and what are the problems with this method? Careful observation but some organisms look different but are closely related and vice versa 13 of 16 What are scientists now using to classify organisms? DNA evidence 14 of 16 What is an evolutionary tree? A model to show evolutionary links between different organisms 15 of 16 What is an evolutionary tree? A model to show evolutionary links between different organisms 16 of 16
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