Tag Archives | sperm

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Environmental Factors Damaging Men’s Reproductive Health

Two new studies appearing in the journal Human Reproduction seem to provide further evidence that environmental factors are adversely affecting men’s reproductive health. The studies suggest that environmental pollutants could be changing the ratio of sperm carrying the X or Y (sex determining) chromosomes and that they could be contributing towards male reproductive disorders. The […]

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Promiscuous Females Make For Competitive Sperm




Howard Hughes Medical Institute researchers have shown that when females are more promiscuous, male genes have to work harder. They determined that a protein controlling semen viscosity evolves more rapidly in primate species with promiscuous females than in monogamous species. The research – published in Nature Genetics – demonstrates that sexual competition among males is […]




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