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Inbreeding depression in Delphinium nelsonii. A. Overall fitness of progeny cohorts and the B. progeny lifespan were all lower when progeny were the result of crosses with pollen taken close to a receptor plant. [1] Inbreeding depression is the reduced biological fitness that has the potential to result from inbreeding, the breeding of related ...
Inbreeding depression can also occur in a large population if individuals tend to mate with their relatives, instead of mating randomly. Due to higher prenatal and postnatal mortality rates, some individuals in the first generation of inbreeding will not live on to reproduce. [ 31 ]
In genetics, the partial dominance hypothesis states that inbreeding depression is the result of the frequency increase of homozygous deleterious recessive or partially recessive alleles. The hypothesis can be explained by looking at a population that is divided into a large number of separately inbred lines.
In biology, outbreeding depression happens when crosses between two genetically distant groups or populations result in a reduction of fitness. [1] The concept is in contrast to inbreeding depression , although the two effects can occur simultaneously on different traits. [ 2 ]
Inbreeding depression is the reduced survival and fertility of offspring of related individuals. [24] A study of 42,855 dachshund litters found that as the inbreeding coefficient increased, litter size decreased and the percentage of stillborn puppies increased, thus indicating inbreeding depression. [25]
Inbreeding depression caused by overdominance cannot be purged, but seems to be a minor cause of overall inbreeding depression, although its actual importance is still a matter of debate. [14] Therefore, predicting the actual evolution of fitness during inbreeding is highly elusive.
Inbreeding depression was found to be an important factor in the maintenance of gynodioecy in an endemic Hawaiian shrub Schiedea adamantis occurring in a single population in Diamond Head Crater Oahu. [15] Inbreeding depression, due to selfing in the hermaphrodites, was considered to be caused by the presence of many mutations of small effect. [15]
Inbreeding can result in inbreeding depression, which is the reduction of fitness of a given population due to inbreeding. Inbreeding depression occurs via appearance of disadvantageous traits due to the pairing of deleterious recessive alleles in a mating pair's progeny. [5]