23 Jul WHICH OF THE GENES IS LOCATED IN THE MIDDLE OF THIS LINKAGE GROUP?
yellow body Show more In Drosophila a female heterozygous for three X-linked recessive mutations [ allele y yellow body w white eyes and c cut wings) was crossed to a male that expressed all mutant phenotypes. Remember that male flies are chromosomally XY and females are XX. (i.e. his genotype could be presented as X y w ct /Y or y w ct/Y ; note that gene order is not known). The results of this cross are shown below. The + symbol in the table below represents the wild type phenotype; Y represents the mutant phenotype of yellow body; W represents the mutant phenotype of white eyes and C represents the mutant phenotype of cut wings. F1 Phenotypes Number of Offspring Y + C 9 Y W C 90 + + C 424 + + + 95 + W C 33 Y W + 376 + W + 6 Y + + 20 1.Identify the F1 phenotype categories that represent offspring receiving a gamete containing a chromosome that is the result of a double cross over event. a) +++ and Y W C b) Y + C and + W + c) Y + + and + W C d) + W C and + + W e) + + + and Y + + 2. Which of the genes is located in the middle of this linkage group? y/y + w/w + c/c + 3. What is the correct genotype of the heterozygous female fly? a. w + y + c + / w y c b. y + c + w + / y c w c. w + y c + / w y + c d. y c w + / y + c + w e. w + y + c/ w y c + 4. What is the map distance between the genes y/y + and c/c + ? a) 5 b) 6.5 c) 12 d) 13.1 e) 17.6 f) 19 5. What is the map distance between the genes y/y + and c/c + ? a) 5 b) 6.5 c) 12 d) 13.1 e) 17.6 f) 19 Show less
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