GEN-3000 Chapter Notes - Chapter 21: Quantitative Genetics, Probability Distribution, Phenotype
11 Dec 2017
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Locus: the fixed position of a gene on a chromosome. Continuous variation: variation without limit on value that can occur in a population. Height in humans are not defined as just short or tall. People fall between the two extremes of super short and super tall. Discontinuous variation: variation in which phenotypic traits are grouped into specific categories. You either cant or can not roll your tongue. Quantitative genetics: genetic analysis of complex characters using math. Look at individual components that make up the overall phenotype. Polygenic characteristics: result from action of many genes. Varying phenotype result from input of genes at more than one loci. Multifactorial or complex traits: polygenic traits that result from gene and environmental influences. Polygenic characters yield phenotypes that are similar even if genotypes are different. Qualitative genetics: can be measured in an individual. Mix with polygenic issues = complex relation b/w genotype and phenotype.
