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Inbreeding avoidance, ... For example, Manning et al. conducted a study in house mice that looked at the species's behavior of communal nesting, or nursing one's own ...
In mice, both males and females choose MHC-dissimilar partners. Mice develop the ability to identify family members during early growth and are known to avoid inbreeding with kin, which would support the MHC-mediated mate choice hypothesis for inbreeding avoidance. [2] Fish are another group of vertebrates shown to display MHC-associated mate ...
In evolutionary biology and psychology, such an ability is presumed to have evolved for inbreeding avoidance, [1] though animals do not typically avoid inbreeding. [2] An additional adaptive function sometimes posited for kin recognition is a role in kin selection. There is debate over this, since in strict theoretical terms kin recognition is ...
In the house mouse, the major urinary protein gene cluster provides a highly polymorphic scent signal of genetic identity that appears to underlie kin recognition and inbreeding avoidance. Thus there are fewer matings between mice sharing MUP haplotypes than would be expected if there were random mating. [56]
However certain natural constraints act to limit the evolution of inbreeding avoidance, particularly when there is a risk of mating with a partner of a different species (heterospecific mating) and losing fitness through hybridization. [16] Inclusive fitness appears to be maximized in matings of intermediately related individuals. [17]
In the house mouse, the major MUP gene cluster provides a highly polymorphic scent signal of genetic identity. Wild mice breeding freely in semi-natural enclosures showed inbreeding avoidance. This avoidance resulted from a strong deficit in successful matings between mice sharing both MUP haplotypes (complete match). [56]
In addition to mice, two species of bumblebee, in particular Bombus bifarius and Bombus frigidus, have been observed to use pheromones as a means of kin recognition to avoid inbreeding. [50] For example, B. bifarius males display "patrolling" behavior in which they mark specific paths outside their nests with pheromones and subsequently "patrol ...
Inbreeding depression is predominantly caused by the homozygous expression of recessive deleterious alleles. [166] Over time, inbreeding depression may lead to the evolution of inbreeding avoidance behaviour. Several examples of animal behaviour that reduce mating of close relatives and inbreeding depression are described next.