Podcast
Questions and Answers
What type of variation tends to be quantitative?
What type of variation tends to be quantitative?
Which type of graph is typically used to represent continuous variation?
Which type of graph is typically used to represent continuous variation?
What is the primary difference between continuous and discontinuous variation?
What is the primary difference between continuous and discontinuous variation?
Which of the following traits is an example of discontinuous variation?
Which of the following traits is an example of discontinuous variation?
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What controls the expression of a characteristic that exhibits continuous variation?
What controls the expression of a characteristic that exhibits continuous variation?
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Study Notes
Properties of Variation
- Continuous variation: no distinct categories, no limit on the value, tends to be quantitative
- Discontinuous variation: distinct categories, no in-between categories, tends to be qualitative
Examples of Variation
- Height and weight: examples of continuous variation
- Tongue rolling, finger prints, and eye colour: examples of discontinuous variation
Representation of Variation
- Line graph: used to represent continuous variation
- Bar graph: used to represent discontinuous variation
Control of Variation
- Polygenic inheritance: controlled by multiple genes and environment, results in a range of phenotypes between two extremes (e.g. height in humans)
- Oligogenic inheritance: controlled by a few genes, results in a limited number of phenotypes with no intermediates (e.g. A, B, AB, and O blood groups in humans)
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Description
Learn about the characteristics and examples of continuous and discontinuous variation in biology. Understand how these different types of variation are represented and controlled by genetic and environmental factors.
