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Homozygous pure lines in cattle can be obtained by

(a) mating of unrelated individuals of same breed

(b) mating of individuals of different breed

(c) mating of individuals of different species

(d) mating of related individuals of same breed.
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Ans. (d) mating of related individuals of same breed.

Sol: When breeding is between animals of the same breed for 4-6 generation, it is called inbreeding. Inbreeding, as a rule, increases homozygosity. Thus, inbreeding is necessary if we want to obtain a pure line in any animal.

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