Conspecific sperm precedence in Drosophila
Article Abstract:
The dynamics of sperm competition or precedence in the Drosophila or fruit fly suggests that the seminal fluid of the second male influences the process. The mechanisms of sperm competition observed in three species of Drosophila indicate that double matings occurring within each produce the second-male precedence pattern that is typically found within species. However, when two males of the same species mated sequentially with a female from a different species, the pattern of sperm precedence was very different from the typical second-male precedence pattern observed within species.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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All's fair when love is war
Article Abstract:
Tracey Chapman has discovered that the seminal fluids which enter the body of the female Drosophila melanogaster during mating reduce the life span of the insect. These seminal fluids are different from the sperms and are produced in the main cells of the male accessory gland. These fluids, though harmful to the female, are highly beneficial to the male since they incapacitate the sperms already existing in the female. This ensures that the sperms of the male insect which court the female last fertilize the eggs.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Selfish genes: a green beard in the red fire ant
Article Abstract:
There is evidence that a green-beard gene is present in Solenopsis invicta, the red imported fire ant. This gene permits the bearer to recognize the same gene in others, causes the bearer to behave differently towards others according to whether they also possess the gene and causes a phenotypic effect. The polygyne S. invicta contains all components of a green-beard effect. These components are mediated by a gene or group of genes closely connected with the locus Gp-9.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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