A
debateful concept that does not even now could unroll the mystery of the
question what results in the phenotypic superiority of a hybrid over its
parents with the certain QTL loci. A concept that has the miraculous phenomenon
in the realm of plant breeding but the exact genetic phenomenon up to now is
unknown. It is a concept called as heterosis which is hybrid vigor, or outbreeding
enhancement, is the improved or increased function of any biological
quality in a hybrid offspring. Different research
conducted on the subject heterosis has resulted the different unrolling but all
have their own results differently. Some scientists concluded that heterosis is
due to the effect of over dominance and epistasis some said that it is due to
the dominance. Some have also claimed that only one effect do not suffices the
phenomenon of the heterosis. There is the need of integration of such genetic
tools. Some research evidences showed that both the dominance and over
dominance have a role in heterosis with some involvement of epistasis although
the relative contribution of each of these mechanisms is still obscure.
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