inbreeding depression


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Related to inbreeding depression: heterosis

inbreeding depression

n.
A loss of vigor and general health that sometimes characterizes organisms that are the product of inbreeding.

inbreeding depression

a reduction in viability resulting from increased homozygosity through INBREEDING.

inbreeding

the mating of closely related organisms or of organisms having closely similar genetic constitutions.

inbreeding coefficient
the probability that the two genes present at a locus in that individual are identical by descent.
inbreeding depression
depression of performance caused by inbreeding.
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Outcross seeds germinated at a greater frequency and produced plants that grew faster than those that resulted from self-pollination, yielding a cumulative inbreeding depression of 0.
The above promising F3 populations also showed negative values for inbreeding depression by indicating stability and performed better then F2 populations even after segregation, and these genotypes can be further studied for enhancement in seed cotton and lint yields.
Inbreeding depression has been reported in four of the 11 studied species of Opuntia (Mandujano et al.
Quantitative trait locus analysis of stage-specific inbreeding depression in the Pacific oyster Crassostrea gigas.
The inbreeding depression estimates (Table 4) obtained for soluble solids, stalk number, stalk height, stalk diameter and stalk weight were compatible with the reported estimates in the literature for yield characters in other crops.
At the phenotypic level, the RRS subpopulations GG(A) and GG(B) have changed little with respect to grain yield, the trait most influenced by heterosis and inbreeding depression, while the yield of the GG(A) x GG(B) population cross increased at 4% [cycle.
Female hosts of lines that showed strong inbreeding depression in one of the eight size or reproductive traits tended to show strong inbreeding depression in the others as well.
The degree to which inbreeding depression determines the evolution of selfing rates, however, has been questioned from different angles.
Although inbreeding depression of the trait was not included in the Mendelian random sampling of this simulation study, the results of this simulation would be valuable because the reduction of the rate of inbreeding was 5 times more than the reduction of breeding values.
For small and isolated populations, genetic drift or mating between relatives may increase homozygosity, and then results in a reduction of the mean phenotypic value of traits associated with fitness, such as inbreeding depression (Charlesworth & Charlesworth 1987, Falconer & Mackay 1996).
The inbreeding depression was estimated using all the records (Table 1) and slopes were -0.