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Unformatted text preview: Genetics 320 Problem Set Four Solutions 1 (1 point) : In a cross involving two marked loci, you recover 150 parental gametes and 50 recombinant gametes. What is the recombination frequency between these loci? Recombination frequency = (number of recombinant gametes) /(total number of gametes) = 50/200 = 1/4 = 0.25 2 (2 points) : Consider two coat-color loci (R/r, G/g), where the genotypes have the following phenotypes R-G- = yellow, rrG- = green, R-gg = red, rrgg = white. Two yellow parents (which we denote P1 and P2) are choosen and crossed to several different parents, and the following data are observed: • When crossed to a purebreeding green parent, both yellow parents gave equal number of yellow and green offspring. • When crossed to a purebreeding red parent, both yellow parents gave equal numbers of red and yellow offspring. • When crossed to a white parent, the first (P1) yellow parent gave equal numbers of yellow and white offspring....
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- Spring '09
- Genetics, Genetic linkage, Chromosomal crossover, homologous recombination, recombinant gametes