DNA

SAMINAR REPORT ON DEOXYRIBONUCLEIC ACID ,[object Object],Shiwani saini M.Sc I Year Zoology GUIDED BY Dr.B.L.Aggarwal Principal & HOD of Zoology Dr.ANUPMA GOUTAM

DEOXYRIBONUCLEIC ACID ,[object Object],[object Object],HISTORY OF DNA RESEARCH:- First man who gave an idea about 3 dimensional structure of DNA was W.T Astbury . He studied with the help of X-ray crystallography & found that DNA is a steak of flat nucleotide. Maurice Wilkins continues Astbury's work and true x-ray diffraction he got the photography & found that DNA is 3

[object Object],[object Object],[object Object],Rosalind Franklin Francis Crick James Watson

[object Object],STRUCTURE OF DNA:- ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Double helical structure of DNA

CHEMICAL NATURE OF DNA :- ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Nucleotide Nucleoside

TYPES OF DNA ( Alternative form of DNA double helix):- ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],A-DNA,B-DNA,& Z-DNA

DNA AS A GENETIC MATERIAL:- ,[object Object],[object Object],[object Object],1.GRIFFITH’SEXPERIMENT ON BACTERIAL TRANSFORMATION:- ,[object Object]

[object Object],[object Object],Transformation in Diplococcus phenomenon

2.BUT GRIFFITH FURTHER EXPERIMENTED SAME EXPERIMENT ON THE MICE AS FOLLOWS:- ,[object Object],[object Object]

[object Object],[object Object]

[object Object],[object Object],[object Object],1. Removed plysaconide capsule from heat killed ‘S’ cells + ‘R’ cells -> Mice dead . 2.Remove protein frection from heat killed ‘S’ cells + ‘R’ cells -> Mice dead . 3. Added DNAase in to heat killed ‘S’ cells + ‘R’ cells -> Mice survived. -> Because third experiment disintegrated DNA & ‘R’ cells could not transform hence mice survived.

3. HERSHEY & CHAES EXPARIMENT ON BACTERIO PHASE TO PROVE DNA AS A GENETIC MATERIAL:- ,[object Object]

DNA

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