Heterosis is the phenomenon of superiority of character of the offspring than the mid parent value in terms of fertility, yield, speed of development and other QTL character. The concept of heterosis is very used in the genetic study for the crop production and evolution of the plants. Though up to now the molecular genetic basis of the heterosis is undefined, the genetic work on this sector has made somehow successful result and the molecular genetic basis of heterosis is going to be coined soon. There are some classical hypotheses to explain the heterosis as dominance and over dominance.....
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