Cyclic fitness variation and polymorphism: cycling selection for litter size in arctic foxes.
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D000818:Animals; D005589:Foxes / Q000235:genetics* / Q000502:physiology; D008098:Litter Size / Q000235:genetics*; D011110:Polymorphism, Genetic; D012098:Reproduction / Q000235:genetics*; D012641:Selection, Genetic