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The correct option is A Out-crossing
In inbreeding, closely related animals of the same breed are allowed to mate with each other for 4-6 generations consecutively. This results in a pure line of organisms, without variation, a concept called as homozygosity. But homozygosity over time may lead to reduced biological fitness in a given population, a phenomenon called as inbreeding depression. To eliminate inbreeding depression, unrelated animals are allowed to mate so as to bring about heterozygosity in the population. When animals within the same breed having no common ancestors on either side of their pedigree up to 4-6 generations are mated, it is called out-crossing. This helps restore fertility during inbreeding depression.
In inbreeding, closely related animals of the same breed are allowed to mate with each other for 4-6 generations consecutively. This results in a pure line of organisms, without variation, a concept called as homozygosity. But homozygosity over time may lead to reduced biological fitness in a given population, a phenomenon called as inbreeding depression. To eliminate inbreeding depression, unrelated animals are allowed to mate so as to bring about heterozygosity in the population. When animals within the same breed having no common ancestors on either side of their pedigree up to 4-6 generations are mated, it is called out-crossing. This helps restore fertility during inbreeding depression.