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a representation of the heterozygous recessive gene trait - it can be any set of letters, but letters a, b, and t are used most often (called a genotype)
Brown, for example, is BB or AA (or TT) because it is homozygous and dominant. Most people who have brown, however, are Aa (Bb, Tt), having some recessive gene that is just not displayed (known as a phenotype)
There...little bit of genetics
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