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| Modern Genetic Analysis Chapter 1. Genetics and the Organism Genetics begins with Variation Figure 1-14. (a) Fruit dimorphism in Plectritis congesta, the sea blush. Any one plant has either all wingless or all winged fruits. In every other way the plants are identical. An allelic difference determines the difference in the fruits. (b) A Drosophila mutant with abnormal wings and a normal fly (wild type) for comparison. These two phenotypes are also caused by alleles of one gene.

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