5C;9A;20;49A
1Lt - 5C | 20 - 9A | 49A - 2Lt ; 1Rt - 20 | 5C - 9A | 49A - 2Rt
5C;9A;20;49A
male lethal crossing-over reduced in X
Roberts, 1964, 1965.
selected on the basis of reduced recombination in one chromosome arm.
Recombination reduced on chromosome 1.
All limits from polytene analysis (FBrf0021565)