The replication of centrioles during spermatogenesis in the Prosobranch snail is described in the light of the theory, first proposed by Pollister, that the supernumerary centriole in the atypical cells are derived from the centromeres of degenerating chromosomes. Fusitriton oregonensis And with this perspective comes the potential for true sperm sociality. WebFusitriton oregonensis (Oregon hairy triton) is a species of large predatory sea snail, a marine gastropod mollusk in the family Cymatiidae. But given that the attachment phase seems to require autonomous sperm behaviour [3], it seems likely that both male and sperm interests effect the grouping. This means that, in addition to conflict among individual sperm, there is also potential conflict between each sperm and the male, which could lead to an evolutionary arms race over which controls sperm morphology and behaviour [5,7]. The nature of starfish WebAbstract. Across murid rodents, those species with relatively larger testes (a predictor of the level of sperm competition experienced by a species) tend to produce sperm with more pronounced apical hooks [10] (Figure 2C and 2D), which presumably promotes grouping. Fusitriton Consistent with this imagery, sperm morphology and behaviour in many organisms appears exquisitely designed to maximise the chances of fertilisation of each individual sperm cell [1]. However, the mixing of sperm from competing males also means that a sperm cell is now more likely to share genes with sperm from the same male than with the average sperm present in the female (positive relatedness). Where there is the potential for altruistically helping close relatives, the potential to spitefully harm others naturally follows. Fusitriton oregonensis Corporate life tells of its advantages: an effectively allied group will reliably trump a group in conflict. Beu A.G. 2010 [August]. It occurs occasionally intertidally and is com-mon to 140 fm on rock, sand, shell, or gravel sub-strate. Adaptations that result from natural selection on sperm, therefore, are expected to favour the individual sperm's personal fitness interests. In some extreme cases, however, we already know the answer. In 1989, the Oregon hairy triton was declared the states official sea shell by the sixty-fifth Legislative Assembly of Oregon.
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