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Wallace's theory was that if species existed in various forms, those which were poorly adapted to change were likely to die out, leaving only the better adapted form to survive and breed Mendel found that characteristics were inherited in dear and predictable patterns. He suggested there were separate units of inherited material and that some characteristics were dominant over others and that they never mixed together. evolution and speciation Speciation is when a new species develops. There is a wide range of genetic variation in both populations. Natural selection occurs in both populations. Speciation occurs when the populations become so different that interbreeding is no longer possible history of genetics Environmental isolation dimate change in one area where an organism lives but not in others. Wilkins & Franklin looked at the structure of DNA using x-rays. Watson & Crick built a 3D model of DNA to explain how it works. They came up with the double helix structure using Franklin's x rays released by Willis without her permission. Mendel's theories were accepted once microscopes showed that chromosomes existed Fossils, the remains of organisms from millions of years ago which can be found in rock and ice evidence for evolution Lamarck's theory of acquired characteristics: Lamarck thought if animals used something a lot over a lifetime that this feature would grow and develop. Any useful changes that took place in an organism during its lifetime would be passed from a parent to its offspring The fossdrecords correlate because most of the fossils have been destroyed and many are stil waiting to be found. Extinction is the permanent loss of all members of a species geneties and evolution Problems with Lamark's theory: There was no evidence for his fountain of life and people didn't like the idea of being descended from worms, People could also be clearly that changes in their bodies eg big muscles were not passed on to their children theories of evolution fossils and extinction Factors which could cause extinctione new predators (can wipe out prey animals if they do not have adaptations to avoid themi, new disease (most likely to cause extinction if the whole ...
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