mendel's law apply only when 1)characters are linked 2)parents are pure breeding 3)f1 monohybrid ratio shows two types of individuals 4) first pair of contrasting characters dependent upon other pairs
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Answer;
Pure breeding parents mean that the plant will always make offspring like itself when self-fertilized over many generations. If parents are not pure breeding, we can not be sure about the genotype of the parent before cross i.e. the character it is showing is due to homozygous or heterozygous genotype. If parents are not pure breeding, no matter up to how many generations we cross plants offspring will be produced randomly with phenotypes that can not be predicted by Mendel's laws.
Pure breeding parents mean that the plant will always make offspring like itself when self-fertilized over many generations. If parents are not pure breeding, we can not be sure about the genotype of the parent before cross i.e. the character it is showing is due to homozygous or heterozygous genotype. If parents are not pure breeding, no matter up to how many generations we cross plants offspring will be produced randomly with phenotypes that can not be predicted by Mendel's laws.So, the correct option is 'Parents are pure breeding'.