Which of the following genotypes represents an individual from a true-breeding line?

Question

Which of the following genotypes represents an individual from a true-breeding line?

Answer 1

In Mendelian genetics, this means that an organism must be homozygous for every trait for which it is considered true breeding; that is, the pairs of alleles that express a given trait are the same. In a purebred strain or breed, the goal is that the organism will "breed true" for the breed-relevant traits.