Figure 10.

Diagrammatic representation of the consequences of crossing over in a female heterozygous for a pericentric inversion. As for the paracentric inversion, paring occurs in a loop but in this case the centromere is within the inverted region. Exchange events in the paired inverted region produce gametes that are grossly aneuploid for large portions of whole chromosome arms. These aneuploid gametes are incapable of producing viable progeny if used in fertilization. Unlike the paracentric inversions there are no anaphase bridges and acentric fragments produced. After Strickberger (1976). The letters and hash marks along the chromosome arms indicate the position of genes.