EvolutionChanges in inherited characteristics of aSPECIES over time
Lamarcks Theory ofEvolution●Proposed by Jean Baptiste de Lamarck●Suggested that characteristics or traitsdeveloped during an organisms lifetime and inherited by his offspring●His hypothesis was called inheritanceof acquired characteristic
Darwins Model of EvolutionPlants and animals on Coast of south Americanislands originally came from Central and SouthAmerica.Species of finches on the island looked similar tomainland finchesMembers of a population best able to surviveand reproduce will pass their traits to the nextgeneration resulting in differences in species.
Natural Selection● Organisms with traits best suited totheir environment will more likelysurvive and reproduce.
Principles of Natural Selection● Overproduction● Variation● Adaptation
Overproduction● More offspring than can be supportedby the environment are producedtherefore many die●
Variation● Within a species there can be a variety of traits● Some variations are better for survival thanothers● Those with better variations survive andreproduce
Adaptation● Any variation that makes an organismbetter suited to its environment
Over Time● Genetic make up of species maychange● Environmental factors can causechanges in source of genes● Geographic isolation can make twopopulations so different they becomedifferent species.