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Period: to
Dates
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Hans & Zacharias Jansen
The creation of the first microscope.
Both Hans and Zacharias are sometimes credited with the creation becuase Hans influenced Zacharias' thinking so much.
The first microscope was just a tube with a few pieces of glass in it.
Zacharias noticed that he could see the object at the end of the tube and it was very enlarged. -
Marcello Malpighi
Marcello was the first person to see red blood cells through a microscope and attributed to the color of them. -
Robert Hooke
Robert Hooke saw the first cells in a thin slice of cork. He was also the person who gave them their name, "cell." -
Francesco Redi
Conducted experiments that were controlled. He found that living things can not just "appear." They come from other living things. -
Anton van Leeuvenhoek
van Leeuvenhoek was the first person to observe bacteria and protozoa. He discovered that there is microscopic life that can only be seen through a microscope. -
Robert Brown
Brown discovered that there is a nucleous in a plant cell. -
Theodor Schwann
Schwann discovered the digestive enzyme. He named it, pepsin. He extended Schleiden's cell theory to animals. He also beleived that cells come from existing cells. -
Matthias Sschleiden
He found that the different parts of the plant organism are cells. He also recognized the important of the cell nucleous. Also he was the co-founder of the cell theory. -
Rudolph Virchow
Virchow disproved the previous cause of the inflamation of a vein causing disease. He used the cell theory to descibe the effects of disease in the tissues and in organs. He stated that disease do not come from tissues or organs in general rather than the indivual cells themselves. -
Gregor Mendel
Mendel is often refered to as, "the father of modern genetics." He discovered the principles of heriditary. His experiments led to the study of heriditary in people from him studies on peas. -
Walter Flemming
He used dye to stain the embyos of a slamander. He then found that there were threadlike materials he could see when the cells started to divide. Those threadlike materials were chromosomes. This was important for later work in meisos and the chromosonal theory of inheritance. -
Thomas Hunt Morgan
Morgan did numerous experiments on fruit flies. From those experiments he established/confirmed the chromosome theory of heredity. He found that genes are linked in a series of chromosomes and are responsible for prominate, hereditary traits. -
Francis Crick & James Watson
Together, these two discovered the structure of DNA. DNA is responsible for all hereditary control of life functions. This was the cornerstone for all genetic studies after the structure was discovered.
