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Gregor Mendel

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Gregor Johann Mendel was an Austrian biologist and mathematician. He is widely known as the founder of modern genetics. Genetics is the study of how biological traits are passed from parents to offspring. Mendel was also an Augustinian friar and the abbot of St. Thomas' Abbey in Brno.

Zawadzki and Mendel
Zawadzki and Mendel

He lived during a time when people knew crossbreeding worked. However, they did not understand the underlying rules of heredity. Mendel's experiments provided the mathematical foundation for how life inherits characteristics.

Mendel's work relied on a process called hybridization. This involves crossing two different varieties of a plant to see the results. He chose to study the pea plant, known as *Pisum sativum*. He focused on seven specific characteristics. These included plant height and flower position. He also studied flower color and pod shape. Other traits included pod color, seed shape, and seed coat tint.

Mendelian inheritance
Mendelian inheritance

He wanted to see if these traits moved in predictable ways.

To find these patterns, Mendel conducted massive experiments between 1856 and 1863. He cultivated and tested approximately 28,000 plants. He observed how traits appeared in different generations. For example, he crossed a true-breeding yellow pea with a green one. In the first generation, all the offspring had yellow seeds. The green trait seemed to have vanished entirely. However, the green color reappeared in the next generation. This happened at a specific ratio of one green to three yellow seeds.

Mendel used new terms to explain these observations. He called the traits that show up easily "dominant." He called the traits that can stay hidden "recessive." He proposed that these traits were controlled by invisible "factors." We now call these factors genes. His work established the Law of Segregation and the Law of Independent Assortment. These are now known as the laws of Mendelian inheritance.

Mendelian inheritance
Mendelian inheritance

They explain how traits are separated and passed on.

Mendel's life was marked by both academic struggle and religious service. He was born in 1822 into a German-speaking family in Silesia. He studied physics and philosophy at the University of Olomouc. He also studied in Vienna under the physicist Christian Doppler. Mendel became a monk to afford his education. He joined the Order of Saint Augustine and took the name Gregor. In 1867, he became the abbot of his monastery. This role brought many administrative duties that eventually limited his scientific research.

Despite his brilliance, the scientific community ignored Mendel for decades. He published his findings in 1866, but they had little impact. His paper was cited only three times in thirty-five years. Even Charles Darwin was unaware of Mendel's specific work. It was not until 1900 that his laws were rediscovered. Three scientists—Hugo de Vries, Carl Correns, and Erich von Tschermak—independently verified his findings. This rediscovery ushered in the modern age of genetics.

Zawadzki and Mendel
Zawadzki and Mendel

It proved that inheritance was not just a simple "blending" of traits.

Mendel died in 1884 at the age of 61. He passed away from chronic nephritis in Brno. His scientific legacy grew much larger after his death. In the early 20th century, scientists debated between Mendelians and biometricians. The Mendelians focused on biological understanding, while biometricians used statistical methods. Eventually, these two views were combined. This led to the modern synthesis of evolutionary biology in the 1930s and 1940s. Today, we recognize Mendel as a pioneer who unlocked the secrets of life.

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