M J Schleiden and TS Schwann formulated cell theory according to which, all living beings are made up of cells, which are the smallest entities that can be called living.
Watson and Crick proposed the double helix model of DNA.
Darwin and Wallace published paper under joint authorship using the title "on the tendency of species to form varieties and on perpetuation of varieties and species by natural selection".
Mendel is known as "Father of Genetics" and Morgan as "Father of experimental Genetics".