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Symbols are used to denote the alleles, or genotype, of a locus.
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Phenotype depends on the alleles that are present, their dominance relationships, and sometimes also interactions with the environment and other factors.
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In a diploid organism, the alleles can be homozygous, heterozygous or hemizygous.
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Allelic interactions at a locus can be described as dominant vs. recessive, incomplete dominance, or co-dominance.
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Two different genes can be on the same chromosome (linked) or on different ones (unlinked)
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Steps:
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Can you identify the mutant? Name the gene after its phenotype
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If you cannot tell which allele is mutant, name the gene after the recessive allele
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Capitalize the first letter for the dominant allele; use lower-case for the recessive allele
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If genes are linked, write the gene symbols together on each side of the slash. If genes are unlinked, they appear on different sides of a semicolon