• Corpus ID: 23800933

Morphological diversity of sperm: A mini review

@article{Prakash2014MorphologicalDO,
  title={Morphological diversity of sperm: A mini review},
  author={Seppan Prakash and Elumalai Prithiviraj and Sekar Suresh and Nagella Venkata Lakshmi and Mohanraj Karthik Ganesh and Murugesan Anuradha and Lakshmanan Ganesh and Premavathy Dinesh},
  journal={Iranian Journal of Reproductive Medicine},
  year={2014},
  volume={12},
  pages={239 - 242}
}
Sperms are highly specialized cells for delivering DNA from male to the ovum. Incredibly, wide degree of diversity in sperm morphology in their basic structures i.e. head, middle piece and tail is found across species. Differences in terms of overall size of the sperm, shape and number of sperm produced are also incredible. One of the key for this variations or diversity in sperm may be associated with female reproductive tract, sperm competition, testicular size and sperm size and number… 

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References

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  • Biology
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  • 2004
Weak evidence is provided suggesting that the evolution of aflagellate sperm could be linked to the removal of selective pressures generated by sperm competition, which occurs when the sperm of two or more males compete to fertilize a female's ova.

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This comparative study attempts to address some fundamental questions of the evolution of mammalian sperm morphometry to explore relationships between the morphometric dimensions of the three essential spermatozoal components: head, mid–piece and flagellum.

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It is suggested that future models of sperm‐size evolution consider not only the role of sperm competition, but also how female control and manipulation of ejaculates after insemination selects for different sperm morphologies.

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It is found that both the gonadosomatic index and sperm numbers increase with intensity of sperm competition across species but that sperm length decreases, which does not fit predictions of current sperm competition theory.

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It is found that sperm numbers increase with ova numbers among externally fertilizing species, fitting the predictions of theoretical models, however, sperm numbers are apparently not related to ovum size.

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It is argued that differences in female reproductive biology may also have influenced the evolution of sperm numbers as well as several other sperm traits, suggesting that variation in sperm fertile lifespan may be related to differences in sperm size.

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