What person altered characters of organisms from one generation of plants to another?

The person who famously altered the characteristics of organisms from one generation of plants to another is Gregor Mendel. Mendel, often referred to as the father of genetics, conducted experiments with pea plants in the mid-19th century, establishing the foundational principles of heredity. His work demonstrated how traits are inherited through dominant and recessive alleles, laying the groundwork for modern genetics.