Gregor Johann Mendel
Gregor Johann Mendel was a Catholic friar and famous Earth scientist from the 19th century. He created the basic principles of genetic heredity and suggested the presence of genes. 

In 2268, Spock found Lokai's unique appearance to be unexplained by Mendel's theories. ()

External links
 
 Mendel's works translated into English

fr:Gregor Mendel
Humans
Scientists