Epistasis (AQA A-Level Biology): Flashcards
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What is epistasis?
What is epistasis?
One gene masks/modifies another gene's expression
In mice, which gene is epistatic to Gene A?
In mice, which gene is epistatic to Gene A?
Gene B
What does Gene A control in mouse coat colour?
What does Gene A control in mouse coat colour?
Melanin distribution pattern
What does Gene B control in mouse coat colour?
What does Gene B control in mouse coat colour?
Melanin production
Phenotype of bb genotype in mice
Phenotype of bb genotype in mice
White (albino) coat
F2 ratio in mouse epistasis cross
F2 ratio in mouse epistasis cross
9:4:3
What does 9:4:3 ratio indicate?
What does 9:4:3 ratio indicate?
Epistatic interaction, not independent assortment
Phenotype of A_B_ genotype in mice
Phenotype of A_B_ genotype in mice
Agouti (grey-brown)
Phenotype of aaB_ genotype in mice
Phenotype of aaB_ genotype in mice
Black
Requirement for biochemical pathway in epistasis
Requirement for biochemical pathway in epistasis
Both enzymes must be functional