Essay On Inbreeding Depression

Inbreeding depression is reduced fitness in a given population as a result of breeding related individuals . It is often a result of the population bottleneck . In general , the higher the genetic variation among the population , education , and the less likely it is that the marriage of relatives suffering from depression . Inbreeding depression seems to be present in most groups of organisms , but varies between mating systems . Hermaphroditic species often carries a lesser degree of inbreeding depression of hybridization of species , and the repeated generations of self- fertilization is believed to cleanse the harmful alleles of the population . For example , it has been proven in the hybridization filamentous certain types remanei suffer severely from inbreeding depression , unlike in C. elegans hermaphrodite relativity, which suffer outbreeding depression . [1]

Breeding between individuals are closely related , and called inbreeding , may be the result of one side to the qualities recessive harmful more to show themselves , because the genome of mates pair are more similar : the qualities recessive can only happen in the offspring if it is present in the genome of both parents , and more genetically similar parents , recessive traits appear often in their offspring . Thus, the more closely related pair and breeding and harmful genes may be more symmetric offspring , resulting in individuals who are not very valid . For alleles that give an advantage in the heterozygous state and / or homozygous dominant , and the fitness of the state symmetric - recessive may be zero ( mean offspring sterile or non- viable ) .

An example of inbreeding depression to the right. In this case, the allele is recessive , which have negative effe...

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...stances , this is a rare occurrence though, as genes can not become too large (and thus increase the likelihood of harmful alleles new show through mutation ) nor too small ( resulting in a frank inbreeding depression ) . Settlement between the island 's population , however, is often seen as highly resistant to inbreeding depression . This stems from the initial population is very small , which should be applicable , and panmixia was in the early stages of new types usually comprehensive. This leads to a very comprehensive elimination of harmful recessive alleles at least . [ 9 ] [10] [11] [ verification needed ] The second type of inbreeding by overdominant heterozygous alleles is impossible to eliminate by panmixia caused by depression. However , local conditions may result in a selective advantage to change , so reducing the fitness of the heterozygous genotype .