The effects of heterozygous inversions on crossing-over in Drosophila ananassae

Genome ◽  
1987 ◽  
Vol 29 (5) ◽  
pp. 802-805 ◽  
Author(s):  
B. N. Singh ◽  
A. K. Singh
Keyword(s):  
Key Words ◽  
Drosophila Ananassae ◽  
Crossing Over ◽  
Heterozygous Condition ◽  
Enhancing Effect ◽  
Chromosome Inversions

Crossing-over was studied in females of Drosophila ananassae under different karyotypic combinations to detect the effects of heterozygous inversions by utilizing three recessive markers of the second chromosome. Because of the presence of a subterminal inversion (2L) in the heterozygous condition, crossing-over between the cu and b genes is completely eliminated. However, 2L heterozygosity enhances the level of recombination between the b and se genes. Furthermore, two third chromosome inversions when heterozygous also exert an enhancing effect on crossing-over in the second chromosome. These results provide evidence for the existence of intra- and inter-chromosomal effects of inversions on crossing-over in D. ananassae. Key words: Drosophila ananassae, crossing-over, inversions, intrachromosomal effects, interchromosomal effects.

Heterozygous inversions and spontaneous male crossing-over in Drosophila ananassae

Genome ◽  
1988 ◽  
Vol 30 (3) ◽  
pp. 445-450 ◽  
Author(s):  
A. K. Singh ◽  
B. N. Singh
Keyword(s):  
Present Finding ◽  
Drosophila Ananassae ◽  
Crossing Over ◽  
Chromosome Inversions

Experiments were conducted to detect the effects of heterozygous inversions on spontaneous crossing-over in males of Drosophila ananassae by using a second chromosome triple recessive stock and four wild stocks. The karyotypic constitution of all the stocks was known. The occurrence of spontaneous male crossing-over has been observed in all the strains tested though the rate of recombination varies. The results show that crossing-over is completely absent between cu and b genes due to inversion heterozygosity in 2L. The males homozygous in 2L show crossing-over in both regions (cu–b, b–se). The inversion heterozygosity in 2L increases the rate of recombination between b and se genes. Furthermore, two third chromosome inversions, when heterozygous also increase crossing-over in the second chromosome. These results suggest that spontaneous male crossing-over in D. ananassae is affected by heterozygous inversions. Thus the present finding lends support to the earlier suggestion that spontaneous crossing-over in males of D. ananassae is meiotic in origin.Key words: Drosophila ananassae, heterozygous inversions, spontaneous male crossing-over.

Effect of Selection on Crossing over in the Males of Drosophila ananassae

1961 ◽  
Vol 95 (880) ◽  
pp. 57-59 ◽  
Author(s):  
A. S. Mukherjee
Keyword(s):  
Drosophila Ananassae ◽  
Crossing Over

scholarly journals On the Effect of the X-Chromosome Inversions on Crossing Over in Drosophila virilis

CYTOLOGIA ◽  
1942 ◽  
Vol 12 (4) ◽  
pp. 357-365 ◽  
Author(s):  
Taku Komai ◽  
Takesi Takaku
Keyword(s):  
X Chromosome ◽  
Drosophila Virilis ◽  
Crossing Over ◽  
Chromosome Inversions

RELATIONS BETWEEN FACTORS CONTROLLING CROSSING OVER AND MUTABILITY IN MALES OF DROSOPHILA ANANASSAE

Genetics ◽  
1983 ◽  
Vol 104 (1) ◽  
pp. 95-112
Author(s):  
Claude W Hinton
Keyword(s):  
Regional Distribution ◽  
The Other ◽  
Drosophila Ananassae ◽  
Crossing Over ◽  
The Third

ABSTRACT Several stocks, selected because they carried previously identified factors governing either crossing over in males or mutability, were examined to determine whether the effects of these factors are restricted to one or the other process. Neither of two dominant enhancers of male crossing over had detectable effects on Minute mutation frequencies among progenies of assayed F1 males. Genetically equivalent F1 males monitored for crossing over showed no unequivocal effect of either of three mutators (two dominant and one extrachromosomal) or of a suppressor of mutability. However, one combination of a dominant crossover enhancer with a dominant mutator showed synergistic increases in both crossover and Minute frequencies, and the possibility exists that a single extrachromosomally transmitted element suppresses both male crossing over and mutability. This suppressor element (or elements) had been previously diagnosed in the pc stock which, in this study, was discovered to have also a dominant enhancer of male crossing over and a dominant mutator occupying separable loci in the third chromosome. The pc enhancer of male crossing over differs from the dominant enhancer in another stock with respect to the regional distribution of crossovers, and the pc mutator is distinguished from another 3-linked mutator by its preferential induction of mutations at the Delta locus.

scholarly journals Synaptonemal Complex and Male Crossing-over in Drosophila ananassae

CYTOLOGIA ◽  
1974 ◽  
Vol 39 (4) ◽  
pp. 829-838 ◽  
Author(s):  
Daigoro Moriwaki ◽  
Mitsuo Tsujita
Keyword(s):  
Synaptonemal Complex ◽  
Drosophila Ananassae ◽  
Crossing Over

scholarly journals Studies on Certain Enhancers of Crossing Over in Drosophila ananassae (A Preliminary Note)

1937 ◽  
Vol 13 (5) ◽  
pp. 232-233 ◽  
Author(s):  
D. Moriwaki
Keyword(s):  
Drosophila Ananassae ◽  
Crossing Over ◽  
Preliminary Note

SEGREGATION DISTORTION AND CROSSING OVER IN MALES OF DROSOPHILA ANANASSAE. I: PRELIMINARY GENETIC ANALYSIS

Genetics ◽  
1971 ◽  
Vol 67 (4) ◽  
pp. 521-532
Author(s):  
A S Mukherjee ◽  
Ashoke K Das
Keyword(s):  
Genetic Analysis ◽  
Segregation Distortion ◽  
Drosophila Ananassae ◽  
Crossing Over

scholarly journals A new enhancer locus, En(2)-hn, and a new allele of the enhancer, En(2)-cc, of male crossing over in Drosophila ananassae.

1987 ◽  
Vol 62 (3) ◽  
pp. 217-224 ◽  
Author(s):  
Muneo MATSUDA ◽  
Yoshiko N. TOBARI
Keyword(s):  
Drosophila Ananassae ◽  
Crossing Over

Crossing over does occur in males of Drosophila ananassae from natural populations

Genome ◽  
2012 ◽  
Vol 55 (7) ◽  
pp. 505-511 ◽  
Author(s):  
Beatriz Goñi ◽  
Muneo Matsuda ◽  
Masa-Toshi Yamamoto ◽  
Carlos R. Vilela ◽  
Yoshiko N. Tobari
Keyword(s):  
Natural Populations ◽  
Drosophila Ananassae ◽  
Crossing Over ◽  
Cytological Analysis ◽  
Wild Type ◽  
Cytological Evidence ◽  
Type Strains ◽  
Chromosome Breakages ◽  
Brazilian Populations

Spontaneous crossing over in males of Drosophila ananassae has been well demonstrated using F1 individuals from crosses between marker stocks and wild type strains. However, the question of its occurrence in males from natural populations remained open. Here we present the cytological evidence that crossing over does occur in males of D. ananassae from two Brazilian populations, sampled nearly 21 years apart, and in two recently sampled populations, one from Indonesia and one from Okinawa, Japan. Cytological analysis of meiosis in males collected from nature and in sons of females from the same population inseminated in nature revealed the presence of chiasmata, inversion chiasmata, and isosite chromosome breakages in the diplotene cells in all sampled populations. These data demonstrate that reciprocal and nonreciprocal exchanges and chromosome breakages, previously reported as related events of male crossing over, do occur at variable frequencies among males from natural populations.

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