Dna stands for biology9/10/2023 ![]() ![]() It was actually taken by another scientist, Rosalind Franklin and it's what's called an X ray diffraction photograph, so Franklin shone X rays through a sample of DNA molecules and the way they scatter or diffract off the molecules, the pattern they leave on the photographic plate, allows you to deduce the structure of those molecules. And it came from a branch of physics called 'X-ray crystallography.' They desperately needed more and better data. Professor Brian Cox: It's here in Cambridge that Francis Crick and James Watson discovered the structure of DNA, the molecule that passes biological information from generation to generation.Ĭrick and Watson's approach to finding that structure was to build physical models of the molecule. That gives you such a buzz and a rush and you just feel that, you know, you've really made a difference. The job I do as a forensic scientist, you know, it's different every day, and that one particular case, it could be that, you know, the breakthrough that the police need. If you're thinking of applying for this job, is to get a good grounding in science, chemistry, physics, biology. With the police, we're using forensic science to help with their criminal investigations, using things like bloodstain pattern analysis, we're looking at body fluids.ĭNA can transfer in many different ways, my saliva could be deposited on a surface or I might have cut myself and left my blood or a hair might have fallen out.ĭNA can survive thousands of years, so we can go back to old crime scenes. Everyone's DNA is almost unique apart from that of identical twins. ![]() And what it is, it codes for your sort of genetic makeup, such as things like your eye colour and your hair colour, sort of your physical and chemical characteristics. ![]() It's found in the nucleus of cells.ĭNA is fundamental to our job. Dr Andrew Hart: My name is Dr Andrew Hart and I'm a senior forensic scientist.ĭNA stands for deoxyribonucleic acid, it's a complex chemical. ![]()
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