Gregor Mendel
Gregor Mendel was a German-speaking Silesian
scientist and Augustinian friar who gained posthumous fame as the founder of the new science of genetics. He is known as "the father of modern genetics" Mendel demonstrated that the inheritance of certain traits in pea plants follows particular patterns, now referred to as the laws of Mendelian inheritance. Mendel cultivated and tested some 29,000 pea plants. This study showed that one in four pea plants had purebred recessive alleles, two out of four were hybrid and one out of four were purebred dominant. His experiments led him to make two generalizations, the Law of Segregation and the Law of Independent Assortment, which later became known as Mendel's Laws of Inheritance.
scientist and Augustinian friar who gained posthumous fame as the founder of the new science of genetics. He is known as "the father of modern genetics" Mendel demonstrated that the inheritance of certain traits in pea plants follows particular patterns, now referred to as the laws of Mendelian inheritance. Mendel cultivated and tested some 29,000 pea plants. This study showed that one in four pea plants had purebred recessive alleles, two out of four were hybrid and one out of four were purebred dominant. His experiments led him to make two generalizations, the Law of Segregation and the Law of Independent Assortment, which later became known as Mendel's Laws of Inheritance.
Frederick Griffith
Frederick Griffith was a British bacteriologist whose focus was the epidemiology and pathology of bacterial pneumonia. He studied the pneumonia bacteria by isolating two strands of bacteria and injected it into mice. He discovered that something transferred from the heat killing the bacteria to live harmless bacteria making them deadly.This led him to hypothesis that some "transforming principle".
Watson and Crick
James Watson is an American molecular biologist, geneticist, and zoologist, best known as a co-discoverer of the structure of DNA in 1953.Francis Crick was an English Molecular biologist, biophysicist, and neuroscientist, and most noted for being a co-discoverer of the structure of the DNA molecule in 1953. Watson saw pictures of "photo 51" and used it to help find other evidence. They described DNA as a double helix, with strands held together by weak hydrogen bonds formed between bases.
Hershy and Chase
Alfred Hershey and Martha Chase helped to confirm that DNA was genetic material in their experiments. Hershey and Chase were also able to prove that the DNA from the phage is inserted into the bacteria shortly after the virus attaches to its host. Using a high speed blender they were able to force the bacteriophages from the bacterial cells after adsorption. They also used radioactive materials in the solution to help show that the protein coat protects the DNA before adsorption stayed outside the cell.
Erwin Chargaff
Erwin Chargaff was an Austrian biochemist who emigrated to the United States during the Nazi era and was a Professor of biochemistry at Columbia University medical school. Through careful experimentation, Chargaff
discovered two rules that helped lead to the discovery
of the double helix structure of DNA. in 1950 he worked with DNA nitrogen bases to help discover and create Chargaffs rules.The first and best known rule was to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units.The second of Chargaff's rules is that the composition of DNA varies from one species to another, in particular in the relative amounts of A, G, T, and C bases.
discovered two rules that helped lead to the discovery
of the double helix structure of DNA. in 1950 he worked with DNA nitrogen bases to help discover and create Chargaffs rules.The first and best known rule was to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units.The second of Chargaff's rules is that the composition of DNA varies from one species to another, in particular in the relative amounts of A, G, T, and C bases.
Roslind Franklin
Rosalind Franklin was a British biophysicist and X-ray
crystallographer who made critical contributions to the
understanding of the fine molecular structures of DNA, RNA, viruses, coal, and graphite. Her DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed helped scientists understand how genetic information is passed from parents to
children. Franklin is best known for her work on the X-ray diffraction images of DNA which led to the discovery of DNA double helix.
crystallographer who made critical contributions to the
understanding of the fine molecular structures of DNA, RNA, viruses, coal, and graphite. Her DNA work achieved the most fame because DNA (deoxyribonucleic acid) plays essential roles in cell metabolism and genetics, and the discovery of its structure helped scientists understand how genetic information is passed helped scientists understand how genetic information is passed from parents to
children. Franklin is best known for her work on the X-ray diffraction images of DNA which led to the discovery of DNA double helix.