wallace and was explained in book on the origin of species by means of Natural Selection Darwin put the theory based on his observations as he travelled round the world on the ship Beagle ID: 1024611
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1. DarwinismThe theory of natural selection was announced by Darwin and wallace and was explained in book “ on the origin of species by means of Natural Selection
2. Darwin put the theory based on his observations as he travelled round the world on the ship Beagle.He made special observations specially on Galapagos Island.
3. Factors of the TheoryRapid Multiplication Limited Food and SpaceStruggle for ExistanceVariationsNatural Selection and Survival of FittestInheritance of useful variationFormation of new species
4. Criticism of TheoryEvidences for Theory :1. Artificial selection2. Mimicry and Protective Coloration3. Correlation between Nectaries of Flowers and Proboscis of Insects
5. Evidences against the Theory1. Inheritance of small Variations 2. Perpetuation of vestigial organs3. Over- specialization of organs4. Lack of reason and Produce Variations5. Inheritance of Acquired characters6. Lack of Transitional Stages
6. Neo- Darwinism or Modern Concept of Evolution No single theory on evolution fully explains mechanism of evolution the modern view about the mode of evolution is a sort of synthesis of Darwin and De Vries theories
7. Factors of the present concept of EvolutionPopulation Gene PoolHardey-Weinberg PrincipalChange in gene frequenciesMigrationNon-Random MatingGenetic DriftMutationVariationGene recombinationHybridization
8. Natural SelectionTypes of Natural SelectionDirectional SelectionDisruptive SelectionStabilizing Selection
9. IsolationTypes: A. Pre mating IsolationGeographical IsolationSpatial IsolationGenetic IsolationEcological IsolationTemporal IsolationPhysiological isolation,Behavioural Isolation
10. Post mating IsolationEcological In viabilityBehavioral sterilityHybrid In viabilityHybrid Sterlity
11. SpeciationHybridization and Poly ployploidy Modes of Speciation Multiplicative speciationPhyletic speciation
12. Kinds of EvolutionDivergent EvolutionConvergent EvolutionParallel EvolutionCo evolutionMacroevolutionMicroevolution