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| Modern Genetic Analysis Chapter 13. Transposable Genetic Elements Transposable Elements in Drosophila Figure 13-17. The phenomenon known as hybrid dysgenesis results from the mobilization of DNA sequences called P elements in Drosophila embryos. When a sperm from a P-carrying strain fertilizes an egg from a non-P-carrying strain, the P elements transpose throughout the genome, usually disrupting vital genes. (After J. D. Watson, Michael Gilman, Jan Witkowski, and Mark Zoller. Recombinant DNA: A Short Course, 2d ed. Copyright © 1992 by James D. Watson, Michael Gilman, Jan Witkowski, and Mark Zoller.)

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