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Different versions of a gene, of which code for different versions of a characteristic. If the alleles in a mtching pair are the same, they are called homozygous alleles. If the alleles in a matching pair are different, they are called [heterozygous] alleles. Some alleles are [dominant] to other forums of a gene and will always be expressed. Some alleles are [recessive] to other forms of the gene and will rarely be expressed.
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