An allele (/əˈliːl/) is a variant form of a given gene. Sometimes, different alleles can result in different observable phenotypic traits, such as different pigmentation. A good example of this trait of color variation is the work Gregor Mendel did with the white and purple flower colors in pea plants; discovering that each color was the result of a “pure line” trait which could be used as a control for future experiments. However, most genetic variations result in little or no observable variation. MORE
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