Untitled timeline

Main

Robert Brown

1831

notes nuclei within cells

M.J. Schleiden & T Schwann

1839

develope the cell theory ( all animals and plants are made up of cells )

Charles Darwin

1859

published the origin of species.

Gregor Mendel

1865

published the results of his investigations of the inheritance of factors in pea plants.

Ernst Haeckel

1866

discovered heredity materials that was in the nucleus

Nettie Stevens

1905

independently described the behavior of sex chromosomes , xx determines female ; xy determines male

Oswald Avery

1944

identifies nucleic acids as the active principle in bacterial transformation.

Erwin Chargaff

1950

shows that the four nucleotides are not present in nucleic acid in stable proportions.

McGinnis

1984

discovers homeotic regulatory genes.

The Human Genome

2000

project presents their preliminary results.