85C--D;89B--C
85C--D;89B--C
The frequency of the inversion chromosomes suggest that populations from North and South America derive from the same original colonising sample.
The chromosomal inversion and enzymatic polymorphism variation in lines selected for high and low heat shock resistance are analysed.
Various combinations of the Dsub\In(O) inversions occur in natural populations. They are sometimes designated Dsub\In(O)3+4 etc.