What are the reasons for Mendel's successes in his breeding experiments?

Explanation

(i) Mendel applied mathematics and statistical methods to his biological data and law of probability to his breeding experiments.
(ii) He followed scientists methods in his experiments and data were recorded accurately with all details of his experiment.
He planned his experiment and executed with large samples.
(iv) The gases or factors which control contrasting characters were present on separate chromosomes.
(v) Mendel selected plants of pure breed lines and the purity was tested by self-crossing the progency for many generations.