By Michael Windelspecht
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That led to her success. Through experimentation, she recognized that the best images were obtained using high-humidity environmental conditions, or “wet” DNA. She then optimized the conditions to produce some of the most detailed images of DNA structure to date. An analysis of the images revealed several important facts on the structure of the DNA molecule. First, the images suggested a helical shape, much like that of a spring. Second, it was obvious that the molecule was highly repetitive. Third, by examining the angles of diffraction of the patterns on the photographic plates, it was possible to measure the physical characteristics of the molecule, specifically the distance between the turns of the helix and relative positioning of the atoms.
Second, Mendel did not confine himself to single-plant crosses, but rather replicated his experiment many times so as to increase the number of offspring. Statistically this increased the validity of his work tremendously. Ss What Did We Know of Genetics Before Mendel? There were three major theories on the basis of inheritance that existed prior to Mendel. Each of these periodically gained and lost popularity over Genetics as a Science time, but remnants of each existed well into the nineteenth century.
4). This represented all the possible combinations from the parents, but only if the traits were acting independent from one another. In other words, seed color was independent from seed shape, and these traits assorted independently in the offspring. This concept serves as the basis of Mendel’s law of independent assortment, or Second Law of Heredity. An examination of the number of seeds in each class indicates that the offspring are not distributed evenly among the classes. Mendel recognized that there was a distinct ratio present in the second generation seeds.