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Inbreeding avoidance, or the inbreeding avoidance hypothesis, is a concept in evolutionary biology that refers to the prevention of the harmful effects of inbreeding. Animals only rarely exhibit inbreeding avoidance. [ 1 ]
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 ...
The avoidance of expression of such deleterious recessive alleles caused by inbreeding, via inbreeding avoidance mechanisms, is the main selective reason for outcrossing. [6] [7] Crossbreeding between populations sometimes has positive effects on fitness-related traits, [8] but also sometimes leads to negative effects known as outbreeding ...
Inbreeding depression is predominantly caused by the homozygous expression of recessive deleterious alleles. [167] 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.
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 ...
Some abnormal behaviours may be related to environmental conditions (e.g. captive housing) whereas others may be due to medical conditions. The list does not include behaviours in animals that are genetically modified to express abnormal behaviour (e.g. reeler mice). A polar bear performing stereotyped pacing.
This is an accepted version of this page This is the latest accepted revision, reviewed on 12 February 2025. Order of mammals Rodent Temporal range: Late Paleocene – recent PreꞒ Ꞓ O S D C P T J K Pg N Capybara Springhare Golden-mantled ground squirrel North American beaver House mouse Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Mammalia Mirorder ...
"The period before World War I led to the initiation of inbreeding in rats by Dr Helen King in about 1909 and in mice by Dr C. C. Little in 1909. The latter project led to the development of the DBA strain of mice, now widely distributed as the two major sub-strains DBA/1 and DBA/2, which were separated in 1929-1930.