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Study Outline
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  1. Quantitative Traits
    1. Quantitative traits exhibit a continuum of phenotypic variation that may follow a normal distribution
    2. Statistical methods are used to evaluate a frequency distribution quantitatively
    3. Some statistical methods compare two variables with each other
  2. Polygenic Inheritance
    1. Polygenic inheritance and environmental factors create overlaps between genotypes and phenotypes
    2. Polygenic inheritance explains DDT-resistance in Drosophila
    3. Quantitative trait loci (QTLs) are now mapped by linkage to molecular markers
  3. Heritability
    1. Phenotypic variance is due to the additive effects of genetic variance and environmental variance
    2. Heritability is the relative amount of phenotypic variation that is due to genetic variation
    3. Heritability of dermal ridge count in human fingerprints is very high
    4. Heritability values are only relevant to particular groups raised in a particular environment
    5. Selective breeding of species can alter quantitative traits dramatically
    6. Heterosis may be explained by dominance or overdominance





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