Lesson 6.1.2c
6.1.2c Isolating mechanisms and artificial selection Quiz: OCR Biology, Unit 7
20 questions
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Lesson 6.1.2c, Isolating mechanisms and artificial selection: 20 multiple choice questions for the OCR Biology (H020), Unit 7: Genetics and evolution, written with Revision Ninja.
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The 20 questions
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Which factor is the primary driver of allopatric speciation?
- Temporal isolation
- Polyploidy
- Geographical isolation
- Behavioural isolation
-
What type of speciation occurs without geographical separation of populations?
- Allopatric speciation
- Artificial speciation
- Sympatric speciation
- Directional speciation
-
Which of the following is a prezygotic isolating mechanism?
- Hybrid inviability
- Low hybrid fertility
- Courtship behaviour differences
- Hybrid sterility
-
Which of the following is a postzygotic isolating mechanism?
- Geographical isolation
- Hybrid sterility
- Gametic isolation
- Temporal isolation
-
What process involves humans selecting organisms with desirable traits for breeding?
- Stabilising selection
- Selective breeding
- Genetic drift
- Natural selection
-
Which of these is a result of artificial selection in animals?
- Finch beak variation
- Antibiotic resistance
- Peppered moth melanism
- Domestic dog breeds
-
What is the main reason for preserving wild-type organism gene banks?
- Retaining useful alleles
- Eliminating recessive mutations
- Increasing current yields
- Preventing natural selection
-
Two snail populations are separated by a river that forms, and over time they can no longer interbreed. What process has occurred?
- Allopatric speciation
- Sympatric speciation
- Artificial selection
- Stabilising selection
-
Which type of isolating mechanism prevents mating due to different breeding seasons?
- Temporal isolation
- Mechanical isolation
- Geographic isolation
- Behavioural isolation
-
What type of reproductive barrier causes hybrid offspring to die before maturity?
- Hybrid sterility
- Gametic incompatibility
- Temporal isolation
- Hybrid inviability
-
What is the expected outcome of repeatedly selecting the highest milk-yielding cows for breeding?
- Increased genetic diversity
- Increased mean yield
- Unchanged mean yield
- Decreased mean yield
-
What happens to genetic diversity at target loci during selective breeding for disease resistance?
- It doubles
- It increases
- It remains unchanged
- It decreases
-
What is a major ethical concern associated with artificial selection in dogs?
- Enhanced hybrid vigour
- Reduced animal welfare
- Rapid speciation
- Increased gene flow
-
What happens to the allele frequencies of two isolated populations without gene flow?
- They diverge
- They converge
- They equalise
- They remain identical
-
Which of these options represents a prezygotic isolating mechanism?
- Hybrid sterility
- Hybrid inviability
- Hybrid breakdown
- Gametic incompatibility
-
What is the main risk of maintaining only a few high-yielding crop lines?
- Faster speciation
- Vulnerability to disease
- Reduced mutation rates
- Increased genetic variation
-
Two populations rarely hybridise and produce offspring with low fitness. What has occurred?
- Artificial selection
- Reproductive isolation
- Adaptive radiation
- Geographic isolation
-
Why does geographical isolation eventually lead to speciation between populations?
- Random mating
- Increased gene flow
- Identical mutation rates
- Divergent selection pressures
-
Mules are sterile because horse and donkey chromosomes cannot pair during meiosis. This demonstrates:
- Temporal isolation
- Geographic isolation
- Prezygotic isolation
- Postzygotic isolation
-
What key issue must be balanced against yield increases when evaluating artificial selection?
- Loss of biodiversity
- Accelerated speciation
- Higher genetic drift
- Increased mutation rate
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