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By Jack Loren
September 17, 2023
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These are members of the same gene pair located on the same locus and all of them control the same character, but each allele affects it somewhat differently.
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The existence of genes is inferred from the observation of segregation and recombination of bodily characters.
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Only those genes are known which have mutated to give rise to at least two distinguishable different alleles.
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Mendel dealt only with a pair of alleles, i.e. one normal and the other its mutant.
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But the normal gene can mutate in more than one way, giving rise to several alternative states.
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Cases are known where sets of alleles contain three, four, or even more members. Such sets are known as multiple alleles.