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Practical Application of Inbreeding
Practical Application of Inbreeding
The correlation of inbreeding and homozygosity exhibits that how inbreeding may cause deleterious effects. As we already know that in a heterozygous individual, the harmful recessive alleles remains masked by their normal dominant alleles. If a heterozygous individual undergoing inbreeding for various generations, there will be equal chances of homozygosity for dominant as well as recessive alleles. In homozygous condition recessive alleles will be able to express their deleterious phenotypic effects "n the individual. On the other hand, the homozygosity for dominant- alleles has equal opportunity to express their beneficial phenotypic effects on inbred races. These considerations have helped the human society to protect it from the deleterious effects of continued inbreeding and to improve its various domestic animals. The .practical applications of inbreeding are following:

1. Because inbreeding causes homozygosity of deleterious recessive genes which may result in defective phenotype, therefore, in human society, the religious ethics unknowingly and modern social norms consciously have condemned and banned the marriages of brothers and sisters. Further the plant breeders and animal breeders too avoid inbreedings in the individuals due to this reason.
2. The inbreeding because, results in the homozygosity of dominant alleles, therefore, it is a best mean of mating among hermaphrodites and self-pollinating plant species of several families. The animal breeder have employed the inbreeding to produce best race horses, dogs, bulls, cattles, etc.

The modern race horses for example, are all descendents of three Arabian stallions imported into England between 1689 and 1730 and mated with several local mares of the slow, heavy type that had carried the medieval knights in heavy armour. The fast runners of F1 were selected and inbred and stallions of the F2 appear as beginning points in the pedigrees of almost all modern race horses. This sort of inbreeding is also called line breeding which has been defined as the special form of inbreeding utilized for the purpose of maintaining a high genetical relations for a desirable ancestor.

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