DNA Structure - GeneticsDNAStructure 12:00

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Genetics – DNA Structure  12:00 Know Griffith’s process and conclusions, not Hershey and Chase Avery, MacLeod, and McCarty looked at work Griffith had done and saw what he had  noted;  transforming material is heritable from parent to progeny and that it affects traits.  Wanted to figure out the chemical identity to learn what genes are made of Made a mixture of dead smooth cells. Broke it apart:  Got a carbohydrate extract.  Extracted differently, got a lipid extract.  Treated differently, got a protein extract.  Then extracted a DNA fraction, then an RNA fraction. Mixed all of the above with live rough cells, looked to see if live smooth cells formed  colonies Didn’t find any in carb/lipid/protein/RNA mixture   rough cells were not transformed to  smooth, so transforming principle isn’t present in that fraction
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DNA Structure - GeneticsDNAStructure 12:00

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