Hi, I have this data:
A three point testcross was made in corn. The alleles C and c result in colored versus colorless seeds, Wx and wx in nonwaxy versus waxy seeds, and Sh and sh in plump versus shrunken seeds. When plants grown from seeds heterozygous for each of these pairs of alleles were testcrossed, the progeny were as follows.

colorless, nonwaxy, shrunken 84
colorless, nonwaxy, plump 974
colorless, waxy, shrunken 20
colorless, waxy, plump 2349
colored, waxy, shrunken 951
colored, waxy, plump 99
colored, nonwaxy, shrunken 2216
colored, nonwaxy, plump 15

and I need to find: a) the genotype of the heterozygous parent, b) the order of the three genes, c) the genetic distance between each gene and d) calculate interference

I have done the problem, just wondering if I am right…….
Genotype of heterozygous parent: cwxSh /CWxsh
Gene order: C Sh Wx
Distance: C—–→Sh = 29cM
Sh—→Wx = 3.2cM
Interference: 44%

my other question is, what is the easiest way to find the gene order in a problem like this? I have been searching tests, etc and I can’t find a good answer. They start to explain a visual method, but they just kinda stop and assume you know what they are talking about. I looked at the parental genotypes and the double recombinant genotypes and the order I came up with seems to work, but I am really not sure………thanks all!