ZOL 341 1st Edition Lecture 13 Outline of Last Lecture I Last lecture was cancelled Outline of Current Lecture II Recombination III Linkage IV Three point mapping Current Lecture recombination percent recombination map units mu cM not the same phenotype as either of the parents percent recombination total recombinants total pyrogeny linkage linkage produces 8 different gamete genotypes with unequal frequencies parental types will be observed most frequently the 6 recombinant gamete classes are produced at frequencies significantly lower than predicted by chance within each crossover class ie single double both gamete types that result have equal frequency double crossover classes are the least frequent because both crossover events must occur to produce these memorize the above rules for three point test cross analysis because they will be important for figuring out the problems three point mapping ask these five questions to help solve problems These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute are the data consistent with the proposal of genetic linkage Ie does the data support the rules stated above what are the alleles on the parental chromosome there will be 3 sets of alleles what is the gene order on the chromosome what order are these alleles in what are the recombinant frequencies of the gene pairs use equation above to calculate recombinant frequency is the frequency of the double crossovers consistent with independence of the single crossovers is the frequency significantly lower than for the single crossovers
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