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Upon the analogy of definition of heterosis and inbreeding depresstion in terms of population genetics,the heterosis is thought to be evaluated overall with fitness.By establishing a mathematical model,the equilibrium status of three genotypes of random mating population(i.e.RR,Rr and rr) under different fitness,which exposes that heterosis is the precondition for multiallele to exist in the population.The heterosis protects the genetic diversity and makes the population owning a stronger self-control and evolution potential by improving the heterozygote’s fitness so as not to wash out different types of genes.It deepens Darwin’s thoughts of individual section by making the individual fitness consonant with population fitness.
Upon the analogy of definition of heterosis and inbreeding depresstion in terms of population genetics, the heterosis is thought to be evaluated overall with fitness.By establishing a mathematical model, the equilibrium status of three genotypes of random mating population (ieRR, Rr and rr under different fitness, which exposes that heterosis is the precondition for multiallele to exist in the population. The heterosis protects the genetic diversity and makes the population owning a stronger self-control and evolution potential by improving the heterozygote’s fitness so as not to wash out different types of genes .It deepens Darwin’s thoughts of individual sections by making the individual fitness consonant with population fitness.