A Drosophila melanogaster cross with the linked genes black…

A Drosophila melanogaster cross with the linked genes black body (b), vestigial wings (vg), and purple eye (p) was conducted. The table below contains the results.   Phenotype # of flies observed Gamete type (P, SCOR1, SCOR2, DCO) +     +     + 532   b    vg    p 521   b    +     + 71   +    vg    p 62   b    +     p 31   +    vg    + 26   b    vg     + 6   +    +     p 4   Calculate the interference of this cross.