  Inspired by recent experiments on the effects of cytosolic crowders on the
organization of bacterial chromosomes, we consider a "feather-boa" type model
chromosome in the presence of non-additive crowders, encapsulated within a
cylindrical cell. We observe spontaneous emergence of complementary helicity of
the confined polymer and crowders. This feature is reproduced within a
simplified effective model of the chromosome. This latter model further
establishes the occurrence of longitudinal and transverse spatial segregation
transitions between the chromosome and crowders upon increasing crowder size.
