Related Experiment Video
Updated: Mar 1, 2026
09:34
Assessing Differences in Sperm Competitive Ability in Drosophila
Published on: August 22, 2013
15.1K
MALE EFFECTS ON FECUNDITY IN DROSOPHILA MELANOGASTER
Ary A Hoffmann, Lawrence G Harshman1
1Department of Genetics, University of California, Davis, CA, 95616.
Summary
Male fruit flies (Drosophila melanogaster) significantly boost female egg-laying (fecundity) and productivity. This effect, likely from microorganisms, stimulates oviposition even without direct mating, revealing complex sex-related fertility interactions.
Area of Science:
- * Reproductive biology
- * Insect behavior
- * Drosophila melanogaster research
Background:
- * Understanding factors influencing insect fecundity is crucial for population dynamics.
- * Previous studies suggest male presence can impact female reproductive output in various species.
Purpose of the Study:
- * To investigate the impact of male Drosophila melanogaster on female fecundity and productivity.
- * To determine if direct contact with males or male-derived cues are responsible for observed effects.
- * To explore the role of microorganisms in mediating male-induced reproductive enhancement.
Main Methods:
- * Females were housed with males or in containers exposed to male-conditioned environments (vials/bottles).
- * Experiments involved vials and bottles conditioned by males, virgin females, or sterile agar.
- * Microorganisms on the laying surface were observed.
Main Results:
- * Females exhibited increased fecundity and productivity when exposed to male effects.
- * The most significant increase in fecundity was observed when vials were previously conditioned by males.
- * Experiments with vials conditioned by virgin females also showed increased fecundity, suggesting a role for transmitted microorganisms.
Conclusions:
- * A male-specific factor stimulates female oviposition in Drosophila melanogaster, independent of mating.
- * Transmitted microorganisms likely play a role in enhancing female fecundity.
- * This study highlights novel, complex fertility interactions between sexes in fruit flies.
Related Concept Videos
02:45The Ratio of X Chromosome to Autosomes
9.9K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
9.9K
02:27Background and Environment Affect Phenotype
7.9K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
7.9K