Determine linear order of genes on the chromosome

In D. Melanogaster cherub wings(ch), black body (b) and cinnabar eyes (cn) result from recessive alleles tht are all located on chromosome 2. A homozygous wild-type fly was mated with a cherub, black, and cinnabar fly, anID the resultinf F1 females were test-crossed with cherub, black, and cinnabar males. The following progeny were produced from the testcross:

ch b cn 753
ch+ b+ cn+ 750
ch b+ cn 105
ch+ b cn+ 102
ch+ b cn 40
ch b+ cn+ 41
ch+ b+ cn 4
ch b cn+ 5

a.Determine the linear order of the genes on the chromosome
b.Calculate the recombinant distances between the 3 loci
c.Determine the coefficient of coincidence and the interference for these three loci.

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