Butler, L.
When a summary of the recombination values for chromosome 2 was being prepared for publication, it was seen that for certain pairs of genes there were two significantly different recombination values. Until some of the crosses have been regrown and other critical crosses made, I cannot be definite as to the type of chromosomal change involved, but it is evident that dv is sometimes at one end of the group and sometimes at the other end, and also that ps may sometimes be 10-20 units from d and near to aw, whereas at other times it may be at the far end. There is a remote possibility that there are two different genes for dv and ps, but this is unlikely as all stocks came from the same source. At present I favor the duplication hypothesis because this would also explain the anomalous results which I obtained with wooly some years ago. The data pertinent to this note are:
dv-m F2R 3735 1574 1477 6 Recombination 6.9±1.2%
F2R 542 146 170 35 " 46.1±2.6%
dv-ps F2R 180 96 101 0 " 9.3±5.0%
ps-m F2R 41 25 14 6 " 44.9±8.3%
ps-0 F2R 259 119 107 8 " 26.1±4.1%
pa-aw F2R 540 209 217 34 " 37.8±2.7%