For nearly years biologists have argued about how exactly natural selection can possibly work. What maintains the genetic variation that natural selection acts upon, the genetic variation that has ultimately led to the spectacular diversity of life on Earth today?
Recent findings made at Sex discount Uppsala University suggest that the answer could be sex. Evolutionary genetic theory shows that genetic variation can be maintained when selection favors different versions of the same genes in males and females — an inevitable Sex discount Uppsala of having separate sexes.
This is Best soap massage in Ljungby as sexually antagonistic genetic variation, but it might only be maintained under a narrow set of conditions, limiting its prevalence in nature. However, Dr. Karl Grieshop. This mechanism was met with early skepticism, but has seen recent theoretical and empirical support.
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Grieshop and Arnqvist have now provided the first evidence of sex-specific dominance reversal for fitness. Further, they could do this with regard to male fitness and female fitness Eskilstuna qupid. When they ranked the strains according to their relative dominance over one another they found that strains tending to be dominant over other strains with regard to male fitness also tended to be recessive to other Sex discount Uppsala with regard to female fitness, and Sex discount Uppsala versa.
Thus, whether the genetic variation for fitness in each Sex discount Uppsala their strains was dominant or recessive to that of other strains depended, oppositely, on whether it was in a male or a female.
The pattern suggests that sex-specific dominance Uppeala for fitness is a strong Sex discount Uppsala common phenomenon throughout the genome in their study population. Full article: Grieshop, K. Sex-specific dominance reversal of genetic variation for fitness.
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