Punnett had appendicitis whenever he was a little kid, and his father had bought him some books to study about that kind of stuff and Punnett was interested.While at Cambridge Punnett became interested in the experimental process, and wrote to William Bateson who was doing Mendelian experimentation on plants and animals. This began a scientific collaboration which helped establish genetics at Cambridge. Bateson and Punnett published the first account of gene linkage in sweet peas and Punnett developed the "Punnett Square" to depict the number and variety of genetic combinations.
Gregor mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.