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In genetics problems, a recessive gene is typically represented by a lowercase letter, such as "a," while the dominant allele is represented by an uppercase letter, like "A." This notation helps distinguish between the two alleles and indicates that the recessive trait will only be expressed phenotypically when an individual carries two copies of the recessive allele (aa). In contrast, individuals with at least one dominant allele (AA or Aa) will display the dominant trait.

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