Female Drosophila heterozygous for three recessivemutations e ( ebony body), st

Question

Female Drosophila heterozygous for three recessivemutations e (ebony body), st(scarlet eyes), and ss (spinelessbristles) were testcrossed, and the following progeny wereobtained:

Phenotype                             Number

wild-type                                67

ebony                                     8

ebony,scarlet                         68

ebony,spineless                     347

ebony, scarlet,spineless         78

scarlet                                     368

scarlet,spineless                     10

spineless                                 54

What is the order of the genes?

I know how to get the middle gene but not how to get the othertwo.

Explanation / Answer

answer : st—ss—e

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