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Inbreeding does not always result in negative fitness consequences, but when inbreeding is associated with fitness reduction it is called inbreeding depression. Inbreeding becomes of increasing concern as the level of homozygosity increases, facilitating the expression of deleterious alleles that reduce the fitness. Habitat fragmentation can ...
Inbreeding is also used to reveal deleterious recessive alleles, which can then be eliminated through assortative breeding or through culling. In plant breeding, inbred lines are used as stocks for the creation of hybrid lines to make use of the effects of heterosis. Inbreeding in plants also occurs naturally in the form of self-pollination.
The military does not solely have negative effects on the environment. [294] There are several examples of militaries aiding in land management, conservation, and greening of an area. [295] Additionally, certain military technologies have proven extremely helpful for conservationists and environmental scientists. [296]
Human-Altered Dispersal signifies the effects that have occurred due to human interference with landscapes and animals. Many of these interferences have caused negative consequences in the environment. For example, many areas have suffered habitat loss, which in turn can have a negative effect on dispersal.
A wildlife corridor in Brazil.. A wildlife corridor, also known as a habitat corridor, or green corridor, [1] is a designated area that connects wildlife populations that have been separated by human activities or structures, such as development, roads, or land clearings.
Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
However, inbreeding also gives opportunity for genetic purging of deleterious alleles that otherwise would continue to exist in population and could potentially increase in frequency over time. Another possible negative effect of inbreeding is weakened immune system due to less diverse immunity alleles as a result of outbreeding depression. [6]
Genetic purging is the increased pressure of natural selection against deleterious alleles prompted by inbreeding. [1]Purging occurs because deleterious alleles tend to be recessive, which means that they only express all their harmful effects when they are present in the two copies of the individual (i.e., in homozygosis).