How symbols are used to represent alleles in a genotype?

How symbols are used to represent alleles in a genotype?
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AA would be used to represent a homozygous dominant gene. Aawould be hybrid or Heterozygous. aa would be homzygous recessiveimplying that the person would only carry the trait instead ofphysically showing it. AA and Aa however, would express that genestrait within their characteristics.
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