DNA - Liberty Union High School District
DNA
Biology Book Ch 8
Standard 4
History and Structure of DNA Chapter 8.1 pg 226-229
1. Hershey & Chase proved DNA is the genetic material found in cells
Erwin Chargaff
DNA composition
all 4 bases (Chemicals) not in equal quantity
bases present in characteristic ratio
A = T ~ 40% G = C ~ 60%
varies from species to species
Rosalind Franklin took x-ray photos of DNA that showed it's 3-D structure
? Rosalind Franklin
? Watson and Crick's discovery built on the work of Rosalind Franklin and Erwin Chargaff. ? Franklin's x-ray images suggested that DNA was a double helix of even width.
? Chargaff's rules stated that A=T and C=G.
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