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Unformatted text preview: You observe the following phenotypic frequencies: One horn, wrinkled knees = .36 One horn, smooth knees = .12 Two horns, smooth knees = .44 Two horns, wrinkled knees =.08 Do these results suggest linkage? If so, why? What is the distance between the horn and knee alleles? The recessive alleles k ( kidney-shaped eyes, wt=round), c (cardinal colored eyes, wt=red), and e (ebony body et=gray) identify three genes on chromosome 3 of Drosophila. Two pure breeding parental strains were crossed to obtain an F1 generation. F1 females were testcrossed with kk cc ee males, and the following progeny phenotypes were obtained: k c e 3 k c + 876 k + e 67 k + + 49 + c e 44 + c + 58 + + e 899 + + + 4 TOTAL 2000 [Ch. 4, #42 in Griffiths text] What were the parental phenotypes? Determine the order of the genes and the map distance between them. Draw the chromosomes of the Parents and F1 generation. Determine if there is interference present....
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- Spring '09