The discovery of how traits are passed on during reproduction is credited to Gregor Mendel, an Austrian monk who lived in the 19th century. He is known as the "father of genetics" for his groundbreaking work with pea plants.

Here's how Mendel's contributions revolutionized our understanding of inheritance:

* Experiments with Pea Plants: Mendel meticulously studied the inheritance of traits in pea plants, focusing on characteristics like flower color, seed shape, and plant height. Through controlled cross-breeding experiments, he observed consistent patterns of inheritance.

* Laws of Inheritance: Based on his observations, Mendel formulated two fundamental laws:

* Law of Segregation: Each individual possesses two alleles (versions) for each trait, and these alleles separate during gamete formation (sperm and egg cells), so each gamete receives only one allele.

* Law of Independent Assortment: Alleles for different traits segregate independently of one another during gamete formation. This means that the inheritance of one trait does not influence the inheritance of another.

* Foundation of Modern Genetics: Mendel's work laid the foundation for modern genetics. His discoveries explained how traits are passed from parents to offspring and provided the basis for understanding the mechanisms of inheritance.

Although Mendel's work was initially overlooked, it was rediscovered in the early 20th century, leading to a surge in genetic research and the development of the field of genetics as we know it today.