cytological types are translocation deletion,
inversion, insertion, isochromosome, dysenteric
chromosome and ring chromosome. An inversion is
a 180-degree change in direction of a
chromosomal segment. Prerequisite for every
inversion is a break at two different sites,
fallowed by reunion of the inverted segment.
Depending on whether the centromere is involved,
a pericentric inversion (the centromere lies
within the inverted segment) and a paracentric
inversion can be differentiated.