[Distribution of the points of breaks in radiation-induced chromosome rearrangements along the polytene chromosomes of Anopheles messeae].

Distribution of 431 rearrangement breaks induced by X-ray treatment in polytene chromosomes of Anopheles messeae was studied. No differences were revealed in the distribution pattern of inversion and translocation breaks. The frequency both of inversion and translocation breaks is much greater in the distal parts of autosomes than in the proximal ones. Within autosomes, breaks are grouped in a number of subdivisions. The points of breaks are Non-randomly distributed. The causes for this non-randomness are discussed.