Incomplete translocations induced in mature sperm of Drosophila
Omel'ianchuk, L.V.; Ponimaskin, E.G.
Genetika 27(3): 411-417
1991
ISSN/ISBN: 0016-6758 PMID: 1855660 Document Number: 371949
Frequencies of incomplete translocations in subcentromeric heterochromatin induced by .gamma.-rays in mature sperm were estimated in the "two right acrocentrics and left compound" system of Drosophila chromosome 2. The value obtained at 3000R was (2.5-2.9) .cntdot. 10-3. Apart from incomplete translocations leading to formation of new metacentrics, acrocentrics were also formed. It is suggested that they appear via reunion of fragments after replication of paternal chromosomes. Incomplete translocation were known to be formed as a result of loss of centric heterochromatin fragment of acrocentric and acentric arm of the compound, as opposed to formation, due to loss of acentric heterochromatin fragment of acrocentric and centric fragment of the compound. Analysis of the dose-effect curve for half-translocations show that the latter are twohit events.