Chromosome alterations.
<P>
<lI> A deletion removes a chromosomal segment.
<lI> A duplication repeats a segment.
<lI> An inversion reverses a segment within a chromosome.
<lI> A   translocation  moves  a  segment  from  one  chromosome  to  a
non-homologous chromosome.
A  reciprocal translocation results from the exchange of fragments
between non-homologous chromosomes.