Genotype, environment, and population numbers.
D000220:Adaptation, Biological; D000818:Animals; D003163:Competitive Behavior; D004330:Drosophila; D004463:Ecology; D014644:Genetic Variation; D005828:Genetics, Population; D005838:Genotype; D011156:Population Density; D011158:Population Growth; D011336:Probability; D011831:Radiation Genetics; D012641:Selection, Genetic; D013696:Temperature