Biology-B6-Speciation 0.0 / 5 ? BiologyEvolution, extinction and natural selectionGCSEAQA Created by: tonisha_Created on: 25-02-23 18:16 Who worked alongside Darwin? Alfred Russel Wallace 1 of 18 Wallace had independently proposed what? the theory of evolution by natural selection 2 of 18 So Darwin and Wallace had decided to? publish their findings jointly 3 of 18 Wallace was mainly interested in how? new species form 4 of 18 What is speciation? the development/formation of a new species 5 of 18 This occurs when populations of the ______ species can ____ longer ______ to produce _____ _______? populations of the same species can no longer reproduce to produce fertile offspring 6 of 18 What causes the species to separate? geographical barrier (isolation) 7 of 18 STAGES (SNAILS) --------------------------- Firstly there will be a _______ in an ______ that are able to _______? will be a species in an area that are able to interbreed 8 of 18 What then may occur? such as? geological activity river changes course 9 of 18 This causes the population of snails to? separate into two groups 10 of 18 The _______ on either side would be slightly ______? conditions different 11 of 18 Therefore natural selection would _______ different ______ on each side? would favour different alleles 12 of 18 This is because there would be different? desirable characteristics 13 of 18 What may then occur? geological activity river changes course again 14 of 18 This allows the snails to? mix again 15 of 18 However the _______ of the snails? phenotypes 16 of 18 Are so different that they can no longer? reproduce to make fertile offspring 17 of 18 The snails are now? two different species 18 of 18
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