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Which of the following is an example of recessive epistasis?


Option: 1

Coat color in mice

Option: 2

Height in humans

Option: 3

Flower color in snapdragons


Option: 4

Seed shape in peas

Answers (1)

  • Recessive epistasis is the term for when recessive alleles at one locus conceal the expression of both (dominant and recessive) alleles at a different locus.
  • The term "supplementary epistasis" is another name for this kind of gene interaction.
  • Pigmentation in mice, which is regulated by the two gene pairs A/a and C/c, is an example of recessive epistasis.
  • When gene A/a is recessive homozygous, dominant C provides black coloring.
  • Agouti is created when gene A is homozygous recessive or heterozygous with gene C/c.
  • Albino/white coats are created when the homozygous recessive version of the gene C/C hides the creation of any color.
  • Gene C/c is hence epistatic in a recessive homozygous state.
  • This happens because a mouse with a recessive c allele at this locus is unable to produce pigment and is albino regardless of the allele present at locus A.
  • Option 1 is the correct answer. 
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