Continuous variation: Features can be measured across a complete range (from one extreme to another). Data collected are quantitative data., Many loci ( that may be on different chromosomes), Many pairs of alleles as many genes may contribute to the inheritance (polygenic), Many intermediate phenotypes between the extremes (e.g. between shortest and tallest)., Environment has a significant influence, Height in humans, milk yield in cattle., Discontinuous variation: Features form distinct classds or categories. Data collected are qualitative data (i.e. discrete or categorical data)., Usually one gene locus but may be a very small number, Usually only one pair of alleles (monogenic) but may be a very small number., Feature either present or absent in phenotype (the differences are discrete categories)., Environment has little or no influence., Ability to roll tongue, human blood groups,

Continuous and discontinuous variation

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