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The chromosome theory of inheritance refers to genetic inheritance of traits, and treats those traits as a consequence of some given genes. Those genes have different alleles, which may be responsible for different traits. Those alleles may be recessive, if they have not effect when paired with a different allele, or dominant, when they always are expressed as the dominant trait.
For example, in simple inheritance cases, if you Father has some trait given by recessive alleles (represented by 'aa') and your mother has a pair of dominant ('AA') alleles, you will have the alleles 'Aa' and present a trait given by the dominant allele, as you draw 50% of you genetic charge from each of your parents.