1674- Lewhoek discovered the first protozoa.  He saw bacteria nine years later.

Lewhoek

1833- Brown discovered the cell nucleus inside of an orchid.

1838- Schleidan and Schwann proposed the cell theory.

1879- Alexander Flemming described chromosome behavior during mitosis.

1939- Siemens produced the first commercial transmission electron microscope.

1941-Coons used florescent labeled antibodies to detect cell antigens

1957- Nucleic acids were separated.

1981- Transgenic mice and fruit flies were produced

1996-The first sheep were cloned.