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Question

Homozygous purelines in cattle can be obtained by:

A
mating of unrelated individuals of the same breed.
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B
mating of individuals of different breed
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C
mating of individuals of different species
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D
mating of related individuals of the same breed
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Solution

The correct option is D mating of related individuals of the same breed
Homozygous pure lines in cattle can be obtained by the mating of related individuals of the same breed and this method is called inbreeding.
And all of the below methods are followed when there is a need for heterosis or heterozygosity.
Mating of unrelated individuals of the same breed is Outbreeding
Mating of individuals of different breed is cross-breeding
Mating of individuals of different species is interspecific hybridization

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