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Biology LibreTexts

14.6: Summary

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

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