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Lecture 19

Lecture 19.docx

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James Thomson

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Lecture 19 DefinitionsFitness Selective advantageAdaptation Missing pollinator of flower with large floral tubeMoth with long proboscisCoevolutionone goes extinct so does otherfrequency of phenotype in variation usually reaches a middle pointTypes of selectionArtificial Domesticated organisms in selection experiments in genetics Selection by humans Has purpose or goalNatural all organismsSelection done not by humans but by biotic and abiotic forcesno purpose Mechanism of selection stabilizingaverage selected for no change in mean trait value directionalshifted overdisruptive favors both extremes 2 parabola not one Birth weight is an example
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