The procedure adopted by Mendel which was different from his predecessors is
Mendel’s selection of garden pea was evidently not an accident, but the result of long insightful thought.
He chose garden pea that was easy to grow and to hybridise artificially. The pea plant is self-fertilising in nature, but it is easy to cross-breed experimentally. The plant reproduces well and grows to maturity in a single season.
Mendel then chose to follow seven visible features(unit characters), each represented by two contrasting forms or traits.
He restricted his examination to one or very few pairs of contrasting traits in each experiment.
He also kept accurate quantitative records, a necessity in genetic experiments. From the analysis of his data, Mendel derived certain postulates that have become the principles of transmission genetics.
So, the correct option is ‘Quantitative analysis of data’.