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This quiz contains 15 questions from a mix of 1 subtopics.
variation features clear, distinct categories, while variation is represented by a spectrum of phenotypes without distinct categories.
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A larger standard deviation indicates:
a higher mean value
more consistent values clustered around the mean
less consistent values widely spread around the mean
a smaller sample size
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Which of the following is an example of discontinuous variation?
height of trees in a woodland
milk yield among cows
human blood types
weight of robins in a population
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Which of the following is an example of continuous variation?
variation in milk yield among cows
the ability to roll the tongue in humans
human blood types
presence or absence of horns in cattle
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A normal distribution curve is typically:
skewed to the left
bell-shaped and symmetrical around a central mean value
skewed to the right
flat and uniform
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Which type of variation is typically caused entirely by genes?
continuous variation
discontinuous variation
neither continuous nor discontinuous variation
both continuous and discontinuous variation
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Describe how genetic factors can contribute to variation.
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Which of the following is true about variation?
it refers to the similarities observed among individuals within a population
despite high similarity, each individual is distinct
it can only arise due to genetic factors
it can only arise due to environmental factors
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Environmental influences can affect:
the type of mutations an organism undergoes
the genetic makeup of an organism
the way an organism's genes are expressed
the number of chromosomes in an organism
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Which of the following is NOT a cause of genetic variation?
changes in environmental conditions
random mating
crossing over between chromatids
independent assortment of chromosomes
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Polygenes are:
genes that are only influenced by the environment
genes that are only present in certain species
genes that have no effect on phenotype
different genes at different loci that all contribute to a particular aspect of phenotype
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Which of the following factors can cause variations among individuals?
both genetic and environmental factors
environmental factors
genetic factors
neither genetic nor environmental factors
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Which of the following is NOT a source of genetic variation?
mutations
random fertilisation
diet
meiosis
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Which of the following is NOT an example of intraspecific variation?
variation in milk yield among cows
variation in human blood types
difference in weight between a bee hummingbird and an ostrich
weight of robins varying from 16 g to 22 g
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Interspecific variation refers to variations:
within a population
between different species
between different populations
within a species
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