https://padlet.com/3340532/75e2siq6rn6c8po6 en-us 2020-11-24 15:45:10 UTC 2025-10-30 14:08:48 UTC hello@padlet.com 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956701661 - Carried out simple but elegant experiments with fruit flies 
- Concluded that genes were physically present on chromosomes
- Test the effect of mutations on physical traits of fruit flies
- Discovered that certain traits were carried on sex-linked chromosomes ]]> 2020-11-24 15:46:37 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956701661 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956703484 - Studied the epidemiology and pathology of 2 strains of streptococcus pneumoniae; exposed mice to a deadly (Type S) and harmless (Type R) strain
- Jan. 1929:  reported the first widely accepted demonstrations of bacterial transformation]]> 2020-11-24 15:47:00 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956703484 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956707922 - Oswald Avery, Colin MacLeod, Maclyn McCarty
- Determined the cause of the transformation in Griffith's experiment.
- They took live R and heat-treated S and mixed it with one of the two en]]> 2020-11-24 15:47:58 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956707922 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956709894 - Erwin Chargaff
- Used paper chromatography and UV spectroscopy to examine the abundance of the nucleobases and he started to notice something very odd
- Measured the amounts of the four bases of DNA in different organisms
- Amounts of A and T are about the same and C and G are about the same
- Chargaff's Rules: the amount of A and T and C and G are always in balance

]]> 2020-11-24 15:48:24 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956709894 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956711130 - Alfred Hershey and Martha Chase
- Experimented with bacteriophages: a virus that infects bacteria; made of DNA and protein
- Concluded that DNA, not protein, was the genetic material
- A protective protein coat was formed around the bacteriophage, but the internal DNA is what conferred its ability to produce progeny inside bacteria
- DNA exists in two forms: A form (dry form) and B form ( wet form) ]]> 2020-11-24 15:48:41 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956711130 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956712416 - Maurice Wilkins and Rosalind Franklin
- collaborated in order to take an x-ray diffraction image of DNA]]> 2020-11-24 15:48:57 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956712416 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956713859 - James Watson and Francis Crick
- Wrote a paper in which they described DNA as a double helix with sugars and phosphates at the center and the nucleobases facing the outside
- The model was shown to be incorrect because it made no chemical sense
- Used the image of DNA to determine that their structure was backwards

]]> 2020-11-24 15:49:15 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956713859 3340532 https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956714815 - Grew Ecoli in heavy nitrogen
- DNA copies itself in a semi-conservative form; splits in half to make and connects to new halves]]> 2020-11-24 15:49:27 UTC https://padlet.com/3340532/75e2siq6rn6c8po6/wish/956714815