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Dominant allele
An allele that is expressed even if only one copy is present (shown with a capital letter, e.g., R).
Heterozygous
Having two different alleles (Rr)
Homozygous
Having two of the same alleles (RR or rr)
Inheritance
The transmission of genetic information from one generation to the next.
Recessive allele
An allele only expressed if two copies are present (shown with a lowercase letter, e.g., r)