scholarly journals Mitotic recombination in Musca domestica L. and its influence on mosaicism, gynandromorphism and recombination in males

1980 ◽  
Vol 35 (2) ◽  
pp. 121-130 ◽  
Author(s):  
P. G. Rubini ◽  
M. Vecchi ◽  
M. G. Franco
Keyword(s):  
Genetic Variability ◽  
Sex Determination ◽  
Musca Domestica ◽  
Relative Frequency ◽  
Mitotic Recombination ◽  
Sex Factors ◽  
Stages Of Development ◽  
Laboratory Populations ◽  
Outward Manifestation

SUMMARYIn the housefly, mosaics appear spontaneously but rarely. Sexual mosaics or gynandromorphs also appear in strains in which sex determination is based on autosomal sex factors. Rare cases of recombination in the male have been reported by some authors. In field and laboratory populations, mitotic plates with figures indicating exchange of chromatid segments are regularly observed in tissues of individuals of both sexes and at all stages of development. All these anomalies are interpreted as outward manifestation of the same phenomenon: mitotic recombination. The cytological basis of mitotic recombination, its relative frequency, its influence on linkage and genetic variability are discussed.

scholarly journals Inheritance of Ddt Resistance in a Laboratory Colony of the Housefly, Musca Domestica

1970 ◽  
Vol 23 (2) ◽  
pp. 377 ◽  
Author(s):  
RW Kerr
Keyword(s):  
Sex Determination ◽  
Musca Domestica ◽  
Laboratory Colony ◽  
Ddt Resistance

Strains of the housefly MUBOO domeatica L., derived by selection from the Canberra laboratory colony established in 1939, were examined genetically and cytologically to determine their composition, in respect to resistance to DDT, and the modes of sex determination and inheritance of this resistance.

scholarly journals EXPERIMENTAL POPULATION GENETICS OF MEIOTIC DRIVE SYSTEMS II. ACCUMULATION OF GENETIC MODIFIERS OF SEGREGATION DISTORTER (SD) IN LABORATORY POPULATIONS

Genetics ◽  
1979 ◽  
Vol 91 (2) ◽  
pp. 339-357
Author(s):  
Terrence W Lyttle
Keyword(s):  
Genetic Variability ◽  
De Novo ◽  
Genetic Material ◽  
Meiotic Drive ◽  
Experimental Population ◽  
Genetic Modifiers ◽  
Segregation Distorter ◽  
Laboratory Populations ◽  
Mean And Variance ◽  
Drive Systems

ABSTRACT The accumulation of modifiers of the meiotic-drive locus Segregation Distorter (SD) in Drosophila melanogaster was monitored by measuring the changes in the mean and variance of drive strength (in terms of "make" value) that occur in laboratory populations when SD and SD+ chromosomes are in direct competition. The particular SD lines used are T(Y;2),SD translocations showing pseudo-Y drive. Four sets of population cages were analyzed. Two sets were monitored for changes in SD fitness and drive strength (presumed to be positively correlated) and analyzed for the presence of autosomal dominant or X-linked modifiers after long periods of time. The remaining two sets were made up of cages either made isogenic or variable for background genetic material, and these were used to test whether the rate of accumulation of modifiers was dependent on initial genetic variability.—Contrary to previous studies in which most suppression of SD action could apparently be attributed to a few dominantly acting modifiers of large effect, the conclusion here is that laboratory populations that are initially free of such major dominant loci evolve to suppress SD action by accumulating polygenic, recessive modifiers, each of small effect, and that much of the required genetic variability can be generated de novo by mutation. Possible explanations for these seemingly incompatible results and the evolutionary implications for SD are considered.

scholarly journals INTERACTIONS OF DIFFERENTIATED PRIMARY SEX FACTORS IN CHIRONOMUS TENTANS

Genetics ◽  
1972 ◽  
Vol 70 (3) ◽  
pp. 491-493
Author(s):  
Peter E Thompson ◽  
Jean S Bowen
Keyword(s):  
Sex Determination ◽  
Chromosome 1 ◽  
Dominant Male ◽  
Chironomus Tentans ◽  
Sex Factors ◽  
Dominant Female ◽  
Different Populations ◽  
The Right ◽  
Determining Factor ◽  
Geographically Isolated

ABSTRACT Different populations of Chironomus tentans, possibly representing geographically isolated races, have two differentiated genic mechanisms of sex determination involving either a dominant male-determining factor in the left arm of chromosome 1 or a dominant female-determining factor at the right tip of chromosome 1. In crosses between these populations, the male-determining factor is epistatic to the female-determining factor. No evidence of intersexuality has been found in such crosses.

scholarly journals The Ceratitis capitata homologue of the Drosophila sex-determining gene sex-lethal is structurally conserved, but not sex-specifically regulated

Development ◽  
1998 ◽  
Vol 125 (8) ◽  
pp. 1495-1500 ◽  
Author(s):  
G. Saccone ◽  
I. Peluso ◽  
D. Artiaco ◽  
E. Giordano ◽  
D. Bopp ◽  
...  
Keyword(s):  
Sex Determination ◽  
Musca Domestica ◽  
Ceratitis Capitata ◽  
Protein Isoforms ◽  
Regulatory Role ◽  
Female Development ◽  
Functional Protein ◽  
Binary Switch ◽  
Sex Lethal ◽  
Phylogenetic Divergence

In Drosophila, Sxl functions as a binary switch in sex determination. Under the control of the primary sex-determining signal, it produces functional protein only in XX animals to implement female development. Here we report that, in contrast to Drosophila, the Sxl homologue in the Medfly, Ceratitis capitata, expresses the same mRNAs and protein isoforms in both XX and XY animals irrespective of the primary sex-determining signal. Also, experiments with two inducible transgenes demonstrate that the corresponding Ceratitis SXL product has no significant sex-transforming effects when expressed in Drosophila. Similar results have been obtained for the Sxl homologue of Musca domestica (Meise, M., Hilfiker-Kleiner, D., Brunner, C., DLbendorfer, A., N?thiger, R. and Bopp, D. (1998) Development 125, 1487–1494). Our findings suggest that Sxl acquired its master regulatory role in sex determination during evolution of the Acalyptratae group, most probably after phylogenetic divergence of the genus Drosophila from other genera of this group.

Genetic control of sex determination in the germ line and soma of the housefly, Musca domestica

Development ◽  
1994 ◽  
Vol 120 (9) ◽  
pp. 2531-2538 ◽  
Author(s):  
D. Hilfiker-Kleiner ◽  
A. Dubendorfer ◽  
A. Hilfiker ◽  
R. Nothiger
Keyword(s):  
Sex Determination ◽  
Musca Domestica ◽  
Germ Cells ◽  
Maternal Effect ◽  
Germ Line ◽  
M Cells ◽  
Female Genotype ◽  
Female Germ Line ◽  
Pole Cells

In Musca domestica, sex in the soma is cell autonomously determined by the male-determiner M, or by the female-determiner FD. Transplanted pole cells (precursors of the germ line) show that sex determination of germ cells is non-autonomous genotypically male pole cells form functional eggs in female hosts, and genotypically female pole cells form functional sperm in male hosts. When M/+ cells undergo oogenesis, a male-determining maternal effect predetermines offspring without M, i.e. of female genotype, to develop as fertile males. FD is epistatic to M in the female germ line, as it is in the soma, overruling the masculinizing effect of M. The results suggest that maternal F product is needed for activation of the zygotic F gene.

scholarly journals Genetic differences between populations of Drosophila melanogaster for a quantitative trait: II. Wild and laboratory populations

1973 ◽  
Vol 22 (1) ◽  
pp. 69-78 ◽  
Author(s):  
C. López-Fanjul ◽  
W. G. Hill
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Variability ◽  
Quantitative Trait ◽  
Primary Source ◽  
Genetic Differences ◽  
Bristle Number ◽  
Laboratory Populations ◽  
Made In

SUMMARYCrosses were made between four populations of Drosophila melanogaster – three of which were laboratory populations (Kaduna, Pacific and Canberra) and one recently captured (Stellenbosch) – and a line previously selected for low sternopleural bristle number for many generations from a Kaduna/Pacific source. In each of six replicate lines from each cross selection was practised for low sternopleural bristle number, and subsequently these replicates were intercrossed and reselected.Initially, similar responses were made in each set of lines, but subsequently more variation between replicates was found in Stellenbosch, which was the primary source of lines which responded to a level below that of the original selected line.It is concluded that this newly captured population contains genetic variability absent from the laboratory populations. Presumably variability has been lost from the latter populations, leaving essentially the same genes segregating in each.

scholarly journals Is Multifactorial Sex Determination in the House Fly,Musca domestica(L.), Stable Over Time?

2016 ◽  
Vol 107 (7) ◽  
pp. 615-625 ◽  
Author(s):  
Richard P. Meisel ◽  
Taira Davey ◽  
Jae Hak Son ◽  
Alec C. Gerry ◽  
Toshio Shono ◽  
...  
Keyword(s):  
Sex Determination ◽  
Musca Domestica ◽  
House Fly ◽  
Over Time
Sign in / Sign up

Export Citation Format

Share Document