SPECIATION L.O: To understand how isolation, genetic variation, natural selection and speciation can cause new species to arise List animals that only live in Australia. Why do they only exist in Australia? Copy and complete selecting the correct words from below A species is a group of _________ organisms that can produce offspring which also ___________ able to reproduce. different will be will not be similar How do species become isolated? Physical isolation Geographic isolation Natural selection Complete the Madagascar worksheet The rise of new species Over time, new species evolve from earlier species. This may happen for a variety of reasons. Populations of one species may become geographically isolated from one another. Genetic variation means that individuals of a population have many different alleles that result in different characteristics. The process of natural selection means that individuals with beneficial characteristics will survive and reproduce. Eventually, populations can become so different that they can no longer interbreed. This is called speciation. Darwins Finches - A historical theory Modern Day examples - Californian Salamander - Central European Blackcap - Lake Malawi fish How do these examples of speciation support Darwin’s theory? Natural selection leads to evolution Pollution and a new predator in Lake Victoria have reduced the number of fish species. However a new species has been discovered that has much larger gills. This enables the new species to live in polluted muddy water where other species, and the predator cannot live. Outline how this new species evolved.