Homework Answers
1. Eye less and normal bristles, Wild eyes and shaven bristles are the parental phenotypes.
Explanation : because in the test cross the parental phenotypes are generally more expressed. in this case these phenotypes are more in number.That is 473 and 447.
2. Wild eyes and normal bristles.Eyeless shaven bristles are the recombinant phenotypes.
Because the recombinant phenotypes are underexpressed and less in number.
3. Map distance can be calculated by the following formula :( where 1% recombination frequency = 1 map unit)
recombinants/total no.of phenotypes x 100
the distance between shaven bristles (s and e) eyeless = 5+7/473+447+5+7 x 100 =1.28 m.u.
s----------------e
1.28m.u.
map distance is mainly used to know the order of genes.
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Practice 1. Cross a female fly with the eyeless mutation for eye shape but normal bristle...
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Practice 7.1. Cross a female fly with the eyeless mutation (a) for eye shape but normal bristle (b+) to a male fly with wild type eye shape (a+) with shaven bristles (b). Both of these genes are located on Mate a female fly with mutant traits of a black body (c), bristle (b), and wing veins (v) to a wild- type male (normal body color (c+), bristle (b+), and wing size (v+)]. These three alleles are located on chromosome II...
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Table 7.2 Phenotype # of each phenotype All mutant (parental) / Wild type (parental) Mutant veins and body color / / / / / / Mutant bristles Mutant veins and bristles Mutant body color Mutant body color and bristles Mutant veins / / / Practice 7.2. 7.2.3. Sketch a genetic map indicating the relative loci for each of these three alleles, and indicate the approximate map distance between each locus. 7.2.4. Calculate crossover interference (1-1-C) 7.2.4. Is it a negative...
Please show work. 2. You mate a female fly with a black body, purple eyes, and...
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2. Three genes and their mutations are found on the third chromosome in fruit fly Drosophila...
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Practice 7.1. Cross a female fly with the eyeless mutation (a) for eye shape but normal bristle (b+) to a male fly with wild type eye shape (a+) with shaven bristles (b). Both of these genes are located on Mate a female fly with mutant traits of a black body (c), bristle (b), and wing veins (v) to a wild- type male (normal body color (c+), bristle (b+), and wing size (v+)]. These three alleles are located on chromosome II...
Table 7.2 Phenotype # of each phenotype All mutant (parental) / Wild type (parental) Mutant veins and body color / / / / / / Mutant bristles Mutant veins and bristles Mutant body color Mutant body color and bristles Mutant veins / / / Practice 7.2. 7.2.3. Sketch a genetic map indicating the relative loci for each of these three alleles, and indicate the approximate map distance between each locus. 7.2.4. Calculate crossover interference (1-1-C) 7.2.4. Is it a negative...
Please show work.
2. You mate a female fly with a black body, purple eyes, and vestigial wing size to a wild- type male. These three alleles are located on chromosome II (autosome) in Drosophila. You testcross one of the Fi females to a male with all three mutations and record the results from the testcross in following table. Phenotype # of each phenotype Body color eye color wing size red red red red 900 le normal vestigial 90 50...
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