1. T. H. Morgan, “An attempt to analyze the constitution of chromosomes on the basis of sex-limited inheritance in drosophilia,” J. Experimental Zoology, 11, 365–413, 1911.
2. C. B. Bridges, “Salivary chromosomes maps,” J. Heredity, 26, 60–64, 1935.
3. ibid, page 64.
4. W.-H. Li, “Evolution of duplicate genes and pseudogenes,” in: Evolution of Genes and Proteins, Masatoshi Nei and Richard K. Koehn, eds., Sinauer Assoc., Sunderland, Mass., 1983, page 14.
5. E. B. Lewis, “Pseudoallelism and gene evolution,” Cold Spring Harbor Symposia on Quantitative Biology, 16, 159–174, 1951.