True-breeding individuals are produced by repeated backcrossing.

Question

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True-breeding individuals are those that produce offspring with the same trait as the parents when self-fertilized or crossed with another true-breeding individual. This is achieved through repeated backcrossing, which involves crossing the desired trait with a true-breeding individual for that trait over several generations to produce offspring that are homozygous for the desired trait.

True-Breeding Individuals Are Produced by Repeated Backcrossing