Step 1: Understanding the Concept:
Historical foundations of classical genetics: Gregor Johann Mendel (1822--1884) initiated his seminal hybridization experiments on Pisum sativum in 1856.
Step 2: Detailed Explanation:
1. Statement I: Gregor Mendel initiated his famous pea hybridization experiments (Pisum sativum) in the monastery garden at Brno in 1856 (conducted from 1856 to 1863 and presented in 1865), NOT in 1858. Hence, Statement I is incorrect.
2. Statement II: Gregor Johann Mendel was born on July 20, 1822 to an ethnic German peasant farming family in Heinzendorf bei Odrau, Austrian Empire (now HynĨice, Czech Republic). Hence, Statement II is true.
Step 3: Final Answer:
Therefore, Statement I is incorrect but Statement II is true, matching option (D).