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| Column-$I$ | Column-$II$ |
| $(a)$ Mating of closely related individuals within the same breed. | $(1)$ Cross breeding |
| $(b)$ Mating of animals of same breed but having no common ancestors on either side for $4-6$ generations. | $(2)$ Interspecific hybridization |
| $(c)$ Mating of animals of two different species. | $(3)$ Out-crossing |
| $(d)$ Breeding of animals belonging to different breeds. | $(4)$ Inbreeding |
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