linkage map Genetics?

Question

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


Determine: 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.

Answer 1

http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=iga.section.962
http://www.ndsu.edu/ndsu/abergstr/webcourses/genetics/tpt/tpt01.htm

Hope this helps!