Abstract
Females homozygous for the sex-linked dominant, Bar, occasionally give rise to wildtype reversions and to forms with more extreme eye reduction than Bar. This behavior was shown by Sturtevant1 to result from unequal crossing-over. The Bar-reverted type was considered to be a deficiency for the Bar gene; while the extreme form, called Ultra-Bar or Double-Bar, was interpreted as a duplication for that gene. Later, Wright2 suggested that Bar itself had something additional present which when lost by unequal crossing-over would give back a normal chromosome (Bar-reverted).
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References
Sturtevant A. H., Genetics, 10, 117–147 (1925).
Wright S. Amer. Nat., 63, 479–480 (1929).
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© 2004 Springer Science+Business Media New York
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Lewis, E.B. (2004). Another Case of Unequal Crossing-Over in Drosophila Melanogaster . In: Lipshitz, H.D. (eds) Genes, Development and Cancer. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8981-9_4
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DOI: https://doi.org/10.1007/978-1-4419-8981-9_4
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