gene, short section of a chromosomes that codes for a characteristic., allele, a different form of a gene. Each allele of a gene codes for a characteristic, but a slightly different version, dominant, allele expressed even if only one copy of the allele is presented., recessive, allele expressed only if there are two copies of the allele are present, phenotype, physical appearance resulting from the inherited alleles., genotype, combination of allele that can be expressed as a phenotype.

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