Chapter 9: Quantitative Genetics
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9 Terms
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Quantitative traits
________ are usually the result of the combined genetic effect of many loci plus the environment.
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Qualitative traits
________: characteristics that show DISCRETE variation.
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directional, stabilizing, and disruptive
Modes of selection
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Disruptive Selection
________ acts against intermediate values of the trait, favoring the extremes.
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allele frequencies
Rather than describing the population in terms of genotypes and ________, classical quantitative genetics describes traits in terms of variance and mean (uses statistical analysis)
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Stabilizing Selection
acts against the extremes of the frequency distribution of the trait, fitness peaks at intermediate values.
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Qualitative traits
characteristics that show DISCRETE variation
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Quantitative traits
characteristics show continuous variation (height, speed) usually measurable through a chart
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Directional Selection
favors 1 extreme of the frequency distribution of the trait over time