According to a 1999 study, 6 percent of children with DiGeorge syndrome inherited the deletion from a parent, while 94 percent had a new deletion.
Immunoglobulin heavy chain deletion, a form of agammaglobulinemia, is a genetic disorder in which part of the antibody molecule is absent.
Alpha thalassemia major results from the deletion of all four alpha globin genes, such that there are no functioning alpha globin genes.
Children born with this chromosomal deletion have a characteristic mewing cat-like cry as infants that is thought to be caused by abnormal development of the larynx (organ in the throat responsible for voice production).
Although most children with DiGeorge syndrome do not inherit the chromosome deletion from their parents, they have a 50 percent chance of passing the deletion on to their own children.