The genes a, b and c are on the same chromosome in Neurosopora, which produces ordered asci. The following asci were obtained from a cross between a b + and + + c Neurospora. The numbers indicate the numbers of asci of each type. Determine the correct gene order and all gene to gene and gene to centromere map distances.

45 5 146 1 10 20 15 58
ab+ ab+ ab+ ab+ ab+ ab+ ab+ ab+
+bc a++ ab+ +++ a+c ++c abc +b+
a++ +bc ++c abc +b+ ab+ +++ a+c
++c ++c ++c ++c ++c ++c ++c ++c

Gene pairs PD NPD TT

ab
ac
bc

Genes FDS SDS

a
b
c

Gene order and distances: include the centromere as -o-