How did Darwin explain adaptive radiation by taking an example of finches ?
(a) How did Darwin explain adaptive radiation by taking an example of finches ?
(b) How did Darwin’s view on evolution differ from that of de-Vries ?
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a) Darwin conjectured that the birds evolved on the island itself There were seed-eating features and other altered beaks arose allowing different types of food eating habits like insectivorous and vegetarian finches This process of evolution of different species in a given geographical area starting from a point and radiating to other areas of (geographical) habitats is called adaptive radiation
| (b) Darwin | de Vries |
| (i) Minor variation (heritable) cause evolution | Mutation caused evolution |
| (ii) Variation are small and directional | Mutation are random and directionless |
| (iii) Evolution is gradual | Single step large mutation / saltation causes speciation |
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