Crossing-over in rearranging chromosomes of Drosophila: The role of delayed pairing
Journal Article
·
· Russian Journal of Genetics
OSTI ID:182173
- Institute of Cytology and Genetics, Novosibirsk (Russian Federation); and others
A Df(2R)MS2-10 deletion of pericentromeric heterochromatin and an Is(Y;2L)419 insertion of Y material in the region 34A, as well as nondisjunction of chromosomes 2 in 2/F(2L); F(2R) females did not directly prevent chromosome arms in chromosome 2 of Drosophila from pairing. However, these events resulted in (1) two- to four-fold decrease in the rate of crossing-over in chromosome 2; (2) a decreased proportion of exchange tetrads two to three times greater for multiple-exchange tetrads than for single-exchange ones; and (3) a decreased rate of crossing-over throughout the entire chromosome arm enhanced in a proximal direction. An In(1)dl-49+B{sup M1}inversion in the X chromosome cancelled the suppression of crossing-over. Crossing-over increased due to an increasing proportion of single-exchange tretrads. The changes in crossing-over found cannot be explained by asynapsis in the chromosomes with rearrangements. According to the authors, these changes are probably accounted for by a delayed pairing of these chromosomes. The delayed pairing of individual chromosome regions or the whole chromosome is considered the most common type of pairing disturbance. It effects on meiosis are discussed. 39 refs., 6 figs., 1 tab.
- OSTI ID:
- 182173
- Journal Information:
- Russian Journal of Genetics, Journal Name: Russian Journal of Genetics Journal Issue: 11 Vol. 31; ISSN RJGEEQ; ISSN 1022-7954
- Country of Publication:
- United States
- Language:
- English
Similar Records
Isolation of chromosomal mutations in Drosophila melanogaster by the nondisjunction test
Mutagenesis and interchromosomal effect on crossing-over in Drosophila
ASYNAPSIS AND MUTABILITY IN DROSOPHILA MELANOGASTER
Journal Article
·
Tue Dec 31 23:00:00 EST 1985
· Sov. Genet. (Engl. Transl.); (United States)
·
OSTI ID:5649908
Mutagenesis and interchromosomal effect on crossing-over in Drosophila
Journal Article
·
Wed Nov 30 23:00:00 EST 1994
· Russian Journal of Genetics
·
OSTI ID:56718
ASYNAPSIS AND MUTABILITY IN DROSOPHILA MELANOGASTER
Journal Article
·
Wed Feb 28 23:00:00 EST 1962
· Genetics (U.S.)
·
OSTI ID:4795611