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№1 слайд![Applied molecular biology](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img0.jpg)
Содержание слайда: Applied molecular biology
Book: Glick, Pasternak, Molecular Biotechnology, Principles and application of recombinant DNA
Biotechnology
Molecular genetics
№2 слайд![What Is Biotechnology? Using](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img1.jpg)
Содержание слайда: What Is Biotechnology?
Using scientific methods with organisms to produce new products or new forms of organisms
Any technique that uses living organisms or substances from those organisms to make or modify a product, to improve plants or animals, or to develop microorganisms for specific uses
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№18 слайд![Genetics - historical](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img17.jpg)
Содержание слайда: Genetics - historical perspective
Practical genetics 7,000 yeas ago
corn breeding - Central America
rice breeding - China
horse pedigree - Babylon
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№43 слайд![Later Concepts - Not until](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img42.jpg)
Содержание слайда: Later Concepts
1900 - Not until 34 years after its publication did Mendel’s work receive additional attention, with publications in 1900 by three Botanists: Hugo de Vries, Carl Correns, and Erich von Tsernak;
1902 - Walter Sutton first integrated the concepts of chromosomes with Mendel’s laws, in studies of grasshopper reproduction and cell division and concluded that Mendel’s heritable factors must be on the chromosomes.
1907 – T.H. Morgan began his work with fruit flies, ultimately mapping gene locations.
№44 слайд![First Structure By actual](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img43.jpg)
Содержание слайда: First Structure
By 1910 actual components known (nucleotides)
Phoebus Levene proposed a tetranucleotide structure for DNA
№45 слайд![So If DNA was a single](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img44.jpg)
Содержание слайда: So…
If DNA was a single covalently bonded tetranucleotide structure then it couldn’t easily encode information
Proteins, on the other hand, had 20 different amino acids and could have lots of variation
Most geneticists focused on “transmission genetics” and passively accepted proteins as being the likely genetic material
№46 слайд![T. H. Morgan s Fruit Flies - s](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img45.jpg)
Содержание слайда: T. H. Morgan’s Fruit Flies 1907-1930s
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№48 слайд![Frederick Griffith,](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img47.jpg)
Содержание слайда: Frederick Griffith, 1928
Transformation of Bacteria
№49 слайд![Avery, McCarty and MacLeod](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img48.jpg)
Содержание слайда: Avery, McCarty and MacLeod
After 10 yrs of effort published work using Griffith’s approach to assay for the genetic material
Used
Cell-free extract of S cells
From 75 liters of cell culture obtained 10-25 mg of “active factor
Proteases, RNases, DNases, etc.
Transforming factor is DNA
№50 слайд![Erwin Chargaff - Digested](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img49.jpg)
Содержание слайда: Erwin Chargaff
1949-1953
Digested many DNAs and subjected products to chromatographic separation
Results
A = T, C = G
A + G = C + T (purine = pyrimidine)
A + T does not equal C + G
Members of a species similar but different species vary in AT/CG ratio
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№52 слайд![X-ray Crystallography of DNA](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img51.jpg)
Содержание слайда: X-ray Crystallography of DNA
Franklin and Wilkins
№53 слайд![Watson and Crick propose](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img52.jpg)
Содержание слайда: Watson and Crick
1953 propose double helix model
Right-handed double helix
№54 слайд![Impact Article in Nature It](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img53.jpg)
Содержание слайда: Impact
Article in Nature
“It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copy mechanism for the genetic material”
Second paper 2 months later describes semiconservative replication and that mutations must change bases in DNA (information encoded in the bases and their order)
DNA became the genetic material…
№55 слайд![DNA Replication](/documents/82e6e08c5ce5f86bc30606d6261a0ba1/img54.jpg)
Содержание слайда: DNA Replication
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