Which one of the following is not true for the experiments of Mendel on pea ?

One peculiarity of pea reproduction is that the petals of the flower close down tightly, preventing pollen grains from entering or leaving. This enforces a system of self-fertilization, in which male and female gametes from the same flower unite with each other to produce seeds. As a result, individual pea strains are highly inbred, displaying little if any genetic variation from one generation to the next. Because of this uniformity, we say that such strains are true breeding.Mendel took advantage of these contrasting traits to determine how the characteristics of pea plants are inherited.Mendel’s experiments had a large sampling size, which gave greater credibility to the data that he collected.