Biology 1202B Lecture Notes - Lecture 5: Genetic Drift, Zygosity, Population Genetics
23 Aug 2016
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Textbook: 18. 1, 18. 2, vocab from 10. 1c, probability rules from 10. 1d. In some populations, individuals vary dramatically in appearance. In other populations, individuals look similar but not identical. Phenotypic variation differences in appearance or function among individuals of a population. Is a difference is heritable, it is passed from generation to generation. Quantitative variation variation that is measured on a continuum rather than in discrete units or categories. Display data on quantitative variation in a bar graph: width of the curve is proportional to the variability among individuals, mean describes average value of the character. Natural selection often changes the mean value of a character or variability within populations. Qualitative variation variation that exists in two or more discrete states, with intermediate forms often being absent. Polymorphism the existence of discrete variants of a character among individuals in a population: such traits are known as polymorphic, calculate phenotypic polymorphisms quantitatively using percentage or frequency of each trait.
