[Exchange mechanism of chromosome loss].
Frequencies of induced losses of autosome 2, free arm of autosome 2 and simultaneous losses of two free arms of autosome 2 were determined as 3.25 x 10(-3), 2.78 x 10(-3), 0.84 x 10(-3), respectively. High frequency of simultaneous losses of two chromosomes may have pointed to the exchange nature of the chromosome losses. The similarity of frequencies of half-translocations in heterochromatin of autosome 2 and frequencies of the losses observed show that the chromosome losses are the consequence of exchanges in chromosomal heterochromatin.
Omes'ianchuk
L V
LV
Ponimaskin
E G
EG
D000818:Animals; D002872:Chromosome Deletion; D004330:Drosophila / Q000235:genetics*; D006570:Heterochromatin / Q000502:physiology; D014178:Translocation, Genetic / Q000235:genetics
D006570:Heterochromatin
Obmennyĭ mekhanizm poter' khromosom.