Inbred depression is a decrease in the viability and productivity of offspring with inbreeding. The cause of inbred depression is the transition of harmful recessive mutations into a homozygous state.
Heterosis (hybrid power) is an increase in the viability and productivity of hybrids compared to parental forms. Heterosis is observed with outbreeding and distant hybridization. This effect is due to an increase in the degree of heterozygosity of the offspring in comparison with the parent forms, because of which harmful recessive mutations do not appear phenotypically.
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