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The theories of heredity attributed to Gregor Mendel, based on his work with pea plants are well known to students of biology.
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Griffith studies 2 different kinds od DNA,streptococcus pneumoniae witch causes pneumonia. Griffith held an expirement with a mouse and the S cells killed the mouse.
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in 1944 Oswald Avery andhis collegues identiified the molecule that can transforn the R stran into an S stran. when the live R scells were exposed to the S stran DNA they were transformed into S cells.Avery concluded that when Scells in griffiths expirement were killed ,DNA was released
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Alfred Hershy and Martha Chase publishes results of expirements that provided defintitive evidence that DNA is transforming factor. Hershey and chase labled both parts of a viruse to determind witch part was injected into the bacteria and thus witch part was genetic materisl.
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were working at Cainbridge University in Camnbridge,England. Using charagaffs data and franklins data, Wattson and crick measured the width of the helix and spacing the bases. Together they built a model of the double helixex that conformed to the other research.
