The avoidance of expression of such deleterious recessive alleles caused by inbreeding, via inbreeding avoidance mechanisms, is the main selective reason for outcrossing. An individual who inherits such deleterious traits is colloquially referred to as inbred. In extreme cases, this usually leads to at least temporarily decreased biological fitness of a population (called inbreeding depression), which is its ability to survive and reproduce. Inbreeding results in homozygosity, which can increase the chances of offspring being affected by recessive traits. By analogy, the term is used in human reproduction, but more commonly refers to the genetic disorders and other consequences that may arise from expression of deleterious recessive traits resulting from incestuous sexual relationships and consanguinity. Inbreeding is the production of offspring from the mating or breeding of individuals or organisms that are closely related genetically. Common fruit fly females prefer to mate with their own brothers over unrelated males. For reproduction by which offspring arise from a single organism, see Asexual reproduction.
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