Another Mans Sperm Outcompete

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Intense reproductive competition often continues long after animals finish mating. In many species, sperm from one male compete with those from others to find and fertilize oocytes. Since this competition occurs inside the female reproductive tract, she often influences the outcome through physical or chemical factors, leading to cryptic female choice. Finally, traits that help males compete with each other are sometimes harmful to females, and female countermeasures may thwart the interests of males, which can lead to an arms race between the sexes known as sexually antagonistic coevolution. New studies from Caenorhabditis nematodes suggest that males compete with each other by producing sperm that migrate aggressively and that these sperm may be more likely to win access to oocytes.

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Competition among sperm to fertilize oocytes is a ubiquitous feature of sexual reproduction as well as a profoundly important aspect of sexual selection. However, little is known about the cellular mechanisms sperm use to gain competitive advantage or how these mechanisms are regulated genetically. In this study, we utilize a forward genetic screen in Caenorhabditis elegans to identify a gene, comp-1 , whose function is specifically required in competitive contexts. We show that comp-1 functions in sperm to modulate their migration through and localization within the reproductive tract, thereby promoting their access to oocytes.

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Jacob Dunn does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment. Republish our articles for free, online or in print, under Creative Commons licence. Most people probably think of sperm as the microscopic tadpole-like things wriggling around in human semen. But there is an astonishing amount of diversity in the size, shape and number of sperm produced by male animals. In fact, despite performing the very same function in all animal species fertilising eggs , sperm are the most diverse cells found among animals.

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Vattentät: A change in social status can quickly lead to a change in the quality of the seminal fluid produced by a male Chinook salmon as he responds to increased reproductive competition from higher-status males. Toni seduces Becky.

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Another Mans Sperm Outcompete

Improving Fertility in Men with Poor Sperm Count - UCLA Urology
Another Mans Sperm Outcompete

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Another Mans Sperm Outcompete
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  • Similarly, in species where each female mates with multiple males, a...
  • Rogue Sperm Indicate Sexually Antagonistic Coevolution in Nematodes
  • COMP-1 promotes competitive advantage of nematode sperm
Another Mans Sperm Outcompete

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1 thoughts on “Another Mans Sperm Outcompete

  1. Male nematode worms may make larger sperm than hermaphrodite worms, but this is not the only reason that sperm from males have a competitive edge.

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