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A Testcross of Trihybrid Drosophila Produced the Following Phenotypes and Number

question 16

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A testcross of trihybrid Drosophila produced the following phenotypes and number of offspring. A table showing phenotype and the number of offspring with each phenotype is below. A plus sign is used for wild-type phenotype; a letter indicates the mutant phenotype for that gene. +++669abc653++c121ab+139+b+2280a+c2215+bc3a++2\begin{array} { l r } + + + & 669 \\a b c & 653 \\+ + c & 121 \\a b + & 139 \\+ b + & 2280 \\a + c & 2215 \\+ b c & 3 \\a + + & 2\end{array}
-Without performing any calculations,which of the following is the gene order?


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