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Gene Interactions. Simple Dominance The heterozygous expresses the dominant phenotype 1 gene 2 alleles 2 phenotypes Incomplete Dominance The heterozygous expresses less than the homozygous dominant individual so it seems incomplete 1 gene 2 alleles 3 phenotypes Codominance

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gene interactions
Gene Interactions
  • Simple Dominance
    • The heterozygous expresses the dominant phenotype
      • 1 gene
      • 2 alleles
      • 2 phenotypes
  • Incomplete Dominance
    • The heterozygous expresses less than the homozygous dominant individual so it seems incomplete
      • 1 gene
      • 2 alleles
      • 3 phenotypes
  • Codominance
    • The heterozygous expresses both dominant alleles
      • 1 gene
      • 2 dominant alleles
      • 3 phenotypes
gene interactions1
Gene Interactions
  • Multiple alleles
    • 3 or more alleles interact to give different phenotypes of the same gene
      • 1 gene
      • 3 or more alleles
      • Multiple phenotypes
    • Blood typing
  • Polygeneic
    • 2 or more genes interact to give a wide range of different phenotypes
      • 2 or more genes
      • 2 alleles
      • Multiple variations of phenotypes
    • Hair and eye color
  • Epistasis
    • A gene controls the expression of a different gene
    • Rooster combs
    • Black, Chocolate, Yellow labs
human blood typing abo
Human Blood Typing (ABO)
  • Presence or absence of AB antigens
    • Type A – A antigen
      • IAIA or IAi
    • Type B – B antigen
      • IBIB or IBi
    • Type AB – Both A and B antigen
      • IAIB
    • Type O – none of the antigens
      • ii
    • Because antigens are recognized by the immune system the right blood must be used for transfusions
      • Wrong blood = the immune system will attack it
      • AB = receive any blood AB = donate to AB only
      • O = receive only O O = donate to anyone
    • RH factors
      • Simple dominance (not the whole story but for our sake)
      • Have Rh antigen = + (dominant)
      • Don’t have Rh antigen = – (recessive)
        • Immune system during pregnancy