Exceptional sperm cooperation in the wood mouse

@article{Moore2002ExceptionalSC,
  title={Exceptional sperm cooperation in the wood mouse},
  author={Harry D.M. Moore and Kater̆ina Dvor̆{\'a}kov{\'a} and N. M. Jenkins and William G. Breed},
  journal={Nature},
  year={2002},
  volume={418},
  pages={174-177}
}
Spermatozoa from a single male will compete for fertilization of ova with spermatozoa from another male when present in the female reproductive tract at the same time. Close genetic relatedness predisposes individuals towards altruism, and as haploid germ cells of an ejaculate will have genotypic similarity of 50%, it is predicted that spermatozoa may display cooperation and altruism to gain an advantage when inter-male sperm competition is intense. We report here the probable altruistic… 
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Of mice and sperm
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  • Biology, Medicine
    Proceedings of the National Academy of Sciences
  • 2006
TLDR
The work by Gomendio et al. (9) in this issue of PNAS reveals that sperm competition may also have shaped the evolution of sperm function in eutherian mammals.
Competition drives cooperation among closely-related sperm of deer mice
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The results suggest that sperm from promiscuous deer mice discriminate among relatives and thereby cooperate with the most closely related sperm, an adaptation likely to have been driven by sperm competition.
Sperm competition does not influence sperm hook morphology in selection lines of house mice
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It is concluded that sperm competition does not influence the degree of sperm hookedness in house mice and there is no evidence of divergence between the selection lines.
Sperm wars and the evolution of male fertility.
TLDR
It is argued that future research must consider sperm and seminal fluid components of the ejaculate as a functional unity, and that research at the genomic level will identify the genes that ultimately control male fertility.
Sperm competition and sperm cooperation: the potential role of diploid and haploid expression.
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Whether and how sperm cooperation may evolve is the focal point of this review and the relative importance of haploid and diploid gene expression for the evolution of sperm cooperation is discussed.
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