heterosis
the vigor of the hybrids, which is greater than that of the parental lines
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
Genetic basis of heterosis. Dominance hypothesis. Scenario A. Fewer genes are under-expressed in the homozygous individual. Gene expression in the offspring is equal to the expression of the fittest parent. Overdominance hypothesis.
result only holds for the neutral case, and is not necessarily true for the case when some alleles are more or less fit than others, for example when the fittest genotype is a heterozygote (a situation often referred to as overdominance or heterosis).
 See also: Genetics, Population, Gene, Organ, Cell
  
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