Biology 1201A Lecture Notes - Lecture 4: Punnett Square, Allele Frequency, Genotype Frequency
14 Jul 2016
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Document Summary
Describing populations (individuals from the same species interacting with each other at a particular time) Exploring population dynamics at equilibrium: mendalian pig simulation. Conclusions about allele and phenotype frequency behavior for populations at equilibrium. We describe allele, genotype, and phenotype frequencies in populations using proportions. F(brown pigs) = 6/15 (6 brown pigs; 15 pigs in total) Phenotype frequencies do not properly represent the ratios that came from the punnett squares. It doesn"t matter which type of allele is more frequent. Allele frequencies give expected offspring genotype frequencies based on probability. We can predict genotype frequencies based on probability. Where those probabilities are the allele frequencies of p and q. Expect f(a1a1) = p2 q = f(a2) f(a1a2) = 2pq f(a2a2) = q2. Conditions under which the hardy-weinberg equilibrium applies: large population so that random chance events have little effect (genetic drift, mating is random.
