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This quiz contains 7 questions from a mix of 1 subtopics.
Describe how genetic factors can contribute to variation.
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Which of the following is true about variation?
it can only arise due to genetic factors
despite high similarity, each individual is distinct
it refers to the similarities observed among individuals within a population
it can only arise due to environmental factors
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Environmental influences can affect:
the number of chromosomes in an organism
the genetic makeup of an organism
the way an organism's genes are expressed
the type of mutations an organism undergoes
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Which of the following is NOT a cause of genetic variation?
independent assortment of chromosomes
crossing over between chromatids
random mating
changes in environmental conditions
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Polygenes are:
genes that are only influenced by the environment
different genes at different loci that all contribute to a particular aspect of phenotype
genes that are only present in certain species
genes that have no effect on phenotype
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Which of the following factors can cause variations among individuals?
environmental factors
neither genetic nor environmental factors
genetic factors
both genetic and environmental factors
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Which of the following is NOT a source of genetic variation?
meiosis
mutations
random fertilisation
diet
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