Epistasis (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What is epistasis?
What is epistasis?
One gene masks another gene's expression
In mouse coat colour, what does Gene A control?
In mouse coat colour, what does Gene A control?
Melanin distribution patterns
What phenotype results from the bb genotype in mice?
What phenotype results from the bb genotype in mice?
White (albino) coat
In the mouse example, which gene is epistatic to the other?
In the mouse example, which gene is epistatic to the other?
Gene B is epistatic to Gene A
What F₂ ratio indicates epistatic interaction in mice?
What F₂ ratio indicates epistatic interaction in mice?
9:4:3
What genotype produces an agouti mouse?
What genotype produces an agouti mouse?
A_B_ (at least one A and one B)
Why does a mouse with genotype Aabb appear white?
Why does a mouse with genotype Aabb appear white?
bb prevents melanin production
What phenotype results from genotype aaB_ in mice?
What phenotype results from genotype aaB_ in mice?
Black coat
In biochemical pathways, what do recessive alleles code for?
In biochemical pathways, what do recessive alleles code for?
Non-functional enzymes
What happens if one gene in a two-step pathway has two recessive alleles?
What happens if one gene in a two-step pathway has two recessive alleles?
The entire pathway is blocked