Variation, dfferences in characteristics among organisms of the same species or population, Continuous variation, a complete gradation of a characteristic from one extreme to the other without breaks, showing a normal (bell-shaped) distribution curve , Discontinuous variation, limited variation producing clear-cut categories with no intermediates;controlled by one or two major genes with little environmental influence, Modificational variability, non-heritable phenotypic changes caused by environmental factors acting on a fixed genotype during development, Nature–nurture interaction, the combined influence of hereditary factors (nature/genotype) and environmental factors (nurture) on the final phenotype.

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