Directional & Stabilising Selection (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is selection?
What is selection?
Organisms better suited survive & reproduce
What shape does variation in polygenic traits typically produce when plotted graphically?
What shape does variation in polygenic traits typically produce when plotted graphically?
Normal distribution curve
When does directional selection occur?
When does directional selection occur?
When environmental conditions change
What happens to the population mean during directional selection?
What happens to the population mean during directional selection?
Moves towards the favoured extreme
In antibiotic resistance, what gives bacteria with penicillinase a survival advantage?
In antibiotic resistance, what gives bacteria with penicillinase a survival advantage?
Enzyme breaks down penicillin
Do bacteria mutate because of antibiotic presence?
Do bacteria mutate because of antibiotic presence?
No, mutations occur randomly
What environmental condition leads to stabilising selection?
What environmental condition leads to stabilising selection?
Stable environmental conditions
What range of human birth weights has the lowest infant mortality rates?
What range of human birth weights has the lowest infant mortality rates?
Between 2.5kg and 4.0kg
How does stabilising selection affect the distribution curve?
How does stabilising selection affect the distribution curve?
Makes it taller & narrower
What type of adaptation is concentrated urine production in kangaroo rats?
What type of adaptation is concentrated urine production in kangaroo rats?
Physiological