Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
What is the effect of excess production of offspring on a population?
reduced genetic variation
decreased survival rates
increased cooperation
competition for scarce resources
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Which type of selection favours one extreme variant of a phenotype?
disruptive selection
stabilising selection
neutral selection
directional selection
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What is the effect of stabilising selection on a normal distribution curve?
no effect on the curve
shifts the curve in the direction of the favoured extreme
narrows the curve
the curve shifts into multiple peaks
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Which type of selection increases the frequency of alleles that code for multiple extreme phenotypes?
directional selection
balancing selection
stabilising selection
disruptive selection
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What is the effect of directional selection on allele frequency?
increases frequency of alleles that code for multiple extreme phenotypes
increases frequency of alleles that code for an average phenotype
decreases frequency of alleles that code for an extreme phenotype
increases frequency of alleles that code for an extreme phenotype
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What is an example of disruptive selection?
peppered moth colouration
bird beaks adapting to become larger and smaller
antibiotic resistance
human birth weights
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What is the effect of disruptive selection on a normal distribution curve?
the curve shifts into multiple peaks either side of where the average phenotype peak used to be
shifts the curve in the direction of the favoured extreme
narrows the curve
no effect on the curve
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What is the effect of directional selection on a normal distribution curve?
the curve shifts into multiple peaks
no effect on the curve
shifts the curve in the direction of the favoured extreme
narrows the curve
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What is the effect of stabilising selection on allele frequency?
increases frequency of alleles that code for an extreme phenotype
decreases frequency of alleles that code for an extreme phenotype
increases frequency of alleles that code for an average phenotype
increases frequency of alleles that code for multiple extreme phenotypes
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