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Mathias J. Schlieden, a German scientist, proposed his cell theory as it applied to plants.
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German scientist Theodore Schwann published his cell theory as it applied ot animals, as opposed to Schleden's plant cell theory.
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This is book written by scientist Charles Darwin, and explained units of heredity and variations in species.
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Geneticist Gregory Mendel of Austria, after years of experimenting with his pea plants, His laws decribe his theories of heredity.
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Walther Fleming,a German biologist, used dyes to stain cells and discovered rods that he called "chromosomes,"
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Dutch botanist Hugo de Vries publishes on his discoveries of gene mutations.
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American biologist Walter Stanborough Sutton discoveries that chromosomes are found in pairs that are structurally similar.
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American biologist Thomas Hunt Morgan and Alfred H. Sturtevant of the U.S showed that genes were located on the chromosome, discoverred X and Y chormosomes, sex-linked traits, and crossing over.
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US scientists George W. Beadle and Edward L. Tatum discovered that genes control the production of enzymes.
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Brtish scientist Francis H. C. Crick and James D. Watson from the United States made a model of the DNA molecule and proved that genes determine heredity.
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A combinaton of many scientists discovered the human genetic code, which allowed scientists to predict characteristics by studying DNA and opened up the fields of genetic engineering and genetic counseling.
