Discuss briefly how pure lines are created in animal husbandry.

Pureline is a breed or strain of plants and animals that have homozygous alleles and have similar characters for various generations.

In animal husbandry, the purelines are created by repeated inbreeding or by the mating of male and female animal of the same breed for 4-5 generations.

Inbreeding increases homozygosity which in turn creates pure lines.

Hence, in animal husbandry pure lines are created by continued inbreeding.