scholarly journals Competitive mating in Drosophila melanogaster

1982 ◽  
Vol 40 (2) ◽  
pp. 201-205 ◽  
Author(s):  
Paul M. Sharp
Keyword(s):  
Drosophila Melanogaster ◽  
Test Procedure ◽  
Limited Resource ◽  
Receptive Female ◽  
Male Mating ◽  
Large Reduction ◽  
Mating Ability ◽  
Male Ratio ◽  
The Past

SUMMARYSelective differences among male Drosophila melanogaster due to differences in ability to compete for mates may often have been under-estimated in the past because, under the test procedure used, females did not represent a limited resource. In the experiment reported here, no difference was detected between inbred and outbred males ‘competing’ to mate with an equal number of females. When the receptive female: male ratio was halved a large reduction in male mating ability due to inbreeding became apparent.

scholarly journals The inbreeding decline and average dominance of genes affecting male life-history characters in Drosophila melanogaster

1995 ◽  
Vol 65 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Kimberly A. Hughes
Keyword(s):  
Drosophila Melanogaster ◽  
Life History ◽  
Male Fertility ◽  
Laboratory Population ◽  
Male Mating ◽  
Fitness Components ◽  
Components Of Variance ◽  
Mating Ability ◽  
Deleterious Alleles ◽  
Male Life History

SummaryThis paper describes the results of assays of male life-history characters in a large outbred laboratory population of D. melanogaster. Lines of flies homozygous for the entire third chromosome and lines of flies carrying two different third chromosomes were assayed for agespecific male mating ability (MMA), age-specific survivorship, male fertility, and body mass. The results of these assays were used to calculate the inbreeding decline associated with each of these traits, the average dominance of deleterious alleles that affect the traits, the genotypic and environmental components of variance for the homozygous lines, and phenotypic and genotypic correlations among the characters. Significant inbreeding decline was found for all characters except the Gompertz intercept and fertility. Early and late MMA show larger effects of inbreeding than any other trait. The inbreeding load for MMA is about the same magnitude as that for egg-to-adult viability, but is substantially less than that associated with total fitness. The estimated inbreeding decline and average dominance of male life-history characters are comparable to estimates for other Drosophila fitness components.

scholarly journals THE EFFECT OF INBREEDING ON COMPETITIVE MALE-MATING ABILITY IN DROSOPHILA MELANOGASTER

Genetics ◽  
1984 ◽  
Vol 106 (4) ◽  
pp. 601-612
Author(s):  
Paul M Sharp
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Variation ◽  
Sexual Selection ◽  
Strong Influence ◽  
Inbred Lines ◽  
Male Mating ◽  
Male Body ◽  
Mating Ability ◽  
Sib Mating ◽  
The Difference

ABSTRACT The effect of full-sib inbreeding on competitive male-mating ability (CI♂) in Drosophila melanogaster was investigated in two experiments. In the first, five inbred lines (with reserves) were assessed up to 18 generations. Linear inbreeding depression, of 5.9% per 10% increase in homozygosity, was observed. In a second experiment, 21 inbred lines were tested after three generations of full-sib mating (without reserves), and the decline with inbreeding was more severe, the male competitive index (CI♂) decreasing by 10.7% per 10% increase in F. The difference between these results is attributed to natural selection acting on variation within the inbred lines in extent of homozygosity, which can arise because of the peculiarly strong influence of linkage in Drosophila. Furthermore, differentiation between the lines may have reflected this variation rather than the various effects of different alleles fixed.—These results imply that the genetic variation in male-mating ability is largely due to dominance (no epistasis was detected) and are consonant with the proposition that intermale sexual selection is a very important component of fitness in D. melanogaster. There was no evidence of a positive correlation between male body size and competitive mating ability.

scholarly journals Male mating success and fertility in Drosophila melanogaster

1985 ◽  
Vol 46 (3) ◽  
pp. 279-285 ◽  
Author(s):  
Linda Partridge ◽  
Trudy F. C. Mackay ◽  
Susan Aitken
Keyword(s):  
Drosophila Melanogaster ◽  
Male Fertility ◽  
Significant Positive Correlation ◽  
Male Mating ◽  
Male Mating Success ◽  
Fitness Components ◽  
Mating Ability ◽  
Dominance Variation ◽  
Positive Correlations ◽  
Outbred Populations

SUMMARYThe male mating ability and male fertility of 40 third chromosome homozygote lines has been measured. There was significant between-line differentiation for both characters, and comparison with a heterozygous stock indicated inbreeding depression and hence dominance variation for them. The characters showed significant positive correlation both with each other and with other fitness components and total fitness, as measured by Mackay (1985). This pattern of large positive correlations between fitness components is not expected to occur in outbred populations.

scholarly journals Expanding the Junction: New Insights into Non-Occluding Roles for Septate Junction Proteins during Development

2021 ◽  
Vol 9 (1) ◽  
pp. 11
Author(s):  
Clinton Rice ◽  
Oindrila De ◽  
Haifa Alhadyian ◽  
Sonia Hall ◽  
Robert E. Ward
Keyword(s):  
Drosophila Melanogaster ◽  
Barrier Function ◽  
Septate Junction ◽  
Accessory Proteins ◽  
Organ Function ◽  
The Past ◽  
Core Components ◽  
Developmental Contexts ◽  
Mechanistic Understanding ◽  
Junction Proteins

The septate junction (SJ) provides an occluding function for epithelial tissues in invertebrate organisms. This ability to seal the paracellular route between cells allows internal tissues to create unique compartments for organ function and endows the epidermis with a barrier function to restrict the passage of pathogens. Over the past twenty-five years, numerous investigators have identified more than 30 proteins that are required for the formation or maintenance of the SJs in Drosophila melanogaster, and have determined many of the steps involved in the biogenesis of the junction. Along the way, it has become clear that SJ proteins are also required for a number of developmental events that occur throughout the life of the organism. Many of these developmental events occur prior to the formation of the occluding junction, suggesting that SJ proteins possess non-occluding functions. In this review, we will describe the composition of SJs, taking note of which proteins are core components of the junction versus resident or accessory proteins, and the steps involved in the biogenesis of the junction. We will then elaborate on the functions that core SJ proteins likely play outside of their role in forming the occluding junction and describe studies that provide some cell biological perspectives that are beginning to provide mechanistic understanding of how these proteins function in developmental contexts.

Mating patterns of different Adh genotypes of Drosophila melanogaster I. Differences in mating ability

Genetica ◽  
1988 ◽  
Vol 78 (3) ◽  
pp. 219-224 ◽  
Author(s):  
J. A. S�nchez Prado ◽  
G. Blanco Lizana
Keyword(s):  
Drosophila Melanogaster ◽  
Mating Ability ◽  
Mating Patterns

scholarly journals Infertility and Male Mating Behavior Deficits Associated With Pde1c in Drosophila melanogaster

Genetics ◽  
2010 ◽  
Vol 186 (1) ◽  
pp. 159-165 ◽  
Author(s):  
David B. Morton ◽  
Rachel Clemens-Grisham ◽  
Dennis J. Hazelett ◽  
Anke Vermehren-Schmaedick
Keyword(s):  
Drosophila Melanogaster ◽  
Mating Behavior ◽  
Male Mating ◽  
Male Mating Behavior

Genetic analysis of vitellogenesis in Drosophila melanogaster: the identification of a temperature-sensitive mutation affecting one of the yolk proteins

Development ◽  
1978 ◽  
Vol 47 (1) ◽  
pp. 111-120
Author(s):  
M. Bownes ◽  
B. D. Hames
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Analysis ◽  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Temperature Sensitive ◽  
Large Reduction ◽  
Yolk Proteins ◽  
Protein Uptake ◽  
Temperature Sensitive Mutation ◽  
Transplant Experiments

A number of female sterile mutations on the first and third chromosomes of Drosophila melanogaster have been screened for defects in the yolk proteins using polyacrylamide gel electrophoresis. Two new mutants were identified. 6m45 accumulates all three yolk proteins (YP1, YP2 and YP3) in the haemolymph but they are all absent from the ovaries suggesting it is a yolk-protein-uptake mutant. In contrast, 1163 is a temperature-sensitive mutation with a large reduction in the quantity of YP1 in the haemolymph and ovaries at 29 °C. Both mutants are autonomous in ovary transplant experiments.

scholarly journals A scenario for the hobo transposable element invasion, deduced from the structure of natural populations of Drosophila melanogaster using tandem TPE repeats

2000 ◽  
Vol 75 (1) ◽  
pp. 13-23 ◽  
Author(s):  
ERIC BONNIVARD ◽  
CLAUDE BAZIN ◽  
BEATRICE DENIS ◽  
DOMINIQUE HIGUET
Keyword(s):  
Drosophila Melanogaster ◽  
Molecular Markers ◽  
World Wide ◽  
Tandem Repeats ◽  
Natural Populations ◽  
The Past ◽  
The World ◽  
Historical Pattern ◽  
The 1960S ◽  
Two Stages

Temporal surveys of hobo transposable elements in natural populations reveal a historical pattern suggesting a recent world-wide invasion of D. melanogaster by these transposons, perhaps following a recent horizontal transfer. To clarify the dynamics of hobo elements in natural populations, and thus to provide further data for our understanding of the hobo invasion, TPE tandem repeats, observed in the polymorphic S region of the element, were used as molecular markers. The number of TPE repeats was studied in 101 current populations from around the world, and in 63 strains collected in the past. This revealed a geographical distribution which seems to have been stable since the beginning of the 1960s. This distribution is compatible with a number of hypotheses for the dynamics of hobo elements. We propose a scenario based on an invasion in two stages: first, a complete invasion by elements with three TPE repeats, followed by the beginning of a new invasion involving hobo elements with five or seven repeats.

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