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