Statement I : Gregor Mendel, conducted hybridisation experiments on garden peas .
Statement II : Mendel investigated characters in the garden pea plant.

Both statements I and II are correct.

Statement I: Gregor Mendel conducted hybridization experiments on garden peas. (True)

• Gregor Mendel, often regarded as the "father of modern genetics." Gregor Mendel, conducted
  hybridisation experiments on garden peas for seven years (1856-1863) and proposed the laws of inheritance in living organisms. His experiments had a large sampling size, which gave greater credibility to the data that he collected. Also, the confirmation of his inferences from experiments on successive generations of his test plants, proved that his results pointed to general rules of inheritance rather than being unsubstantiated ideas.
  
  

Statement II: Mendel investigated characters in the garden pea plant. (True)

• Mendel investigated characters in the garden pea plant that were manifested as two opposing traits, e.g., tall or dwarf plants, yellow or green seeds. This allowed him to set up a basic framework of rules governing inheritance, which was expanded on by later scientists to account for all the diverse natural observations and the complexity inherent in them.

Both statements accurately describe Mendel's experiments with garden peas. He conducted hybridization experiments to study specific traits and characteristics in these plants, ultimately establishing fundamental principles of heredity and laying the groundwork for the field of genetics.