How did Gregor Mendel’s pea plant experiments contribute to the development of genetic engineering?

Gregor Mendel’s pea plant experiments did not directly involve modern genetic engineering, but they established the foundational principles of genetics that make the field possible today.12

Mendel’s methodology—using controlled cross-pollination to track specific traits—provided the first evidence of discrete hereditary units, now known as genes. His discovery of the law of segregation and the law of independent assortment allowed scientists to understand how traits are inherited and how they can be predicted in offspring.13

These principles are essential to genetic engineering because they provide the framework for identifying, isolating, and manipulating specific genes. For example, in backcrossing, breeders use Mendelian principles to transfer desirable traits—such as disease resistance—from one organism to another while maintaining the genetic background of a superior cultivar. While modern genetic engineering often utilizes recombinant DNA technology to insert genes directly, a deep understanding of Mendelian inheritance remains necessary to fully comprehend how these genes function within a whole organism.425