A single crossover (SCO) within a paracentric inversion produces two parental chromatids and two recombinant chromatids with duplications and deletions.

One recombinant chromatid is acentric (lacking a centromere), the other is dicentric (two centromeres); both pose problems in anaphase.

The acentric chromatid may move randomly to one pole, or it may be lost,

The dicentric chromatid is pulled in two directions and breaks apart, resulting in deletions.