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| Modern Genetic Analysis Chapter 8. Chromosome Mutations Chromosomal Rearrangements Figure 8-25. Looped configurations in a Drosophila deletion heterozygote. In the meiotic pairing, the normal homolog forms a loop. The genes in this loop have no alleles with which to synapse. Because polytene chromosomes in Drosophila have specific banding patterns, we can infer which bands are missing from the homolog with the deletion by observing which bands appear in the loop of the normal homolog. (Part b from William M. Gelbart.)

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