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The following three recessive genes are found in corn.  Brittle endosperm (bt1), glossy leaf (gl17), and ragged seedling (rgd1). A tri-hybrid is test-crossed producing the following offspring.

 

            brittle, glossy, ragged              258

            brittle, glossy                           121

            ragged                                     119

            glossy, ragged                           26

            wild-type                                 242

            brittle, ragged                              7

            glossy                                          5

            brittle                                         22

                                                            800

 

            a--if the genes are linked, determine the relative order and map distances (both      measured and actual).

 

 

 

 

            b--what is the coefficient of coincidence for double crossovers.

 

 

 

            c--Is there any crossover interference?  If so, how much?

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