Several mutable types have been isolated from virus exposed cultures.
One of these has been designated Dt6 and is located on chromosome 4. The
relation to Su su is indicated below:
|Su Dt6||Su dt6||su Dt6||su dt6|
Three point tests involving the cross a su Gl3 dt6/a Su gl3 Dt6 were inconclusive, both gl3 and dt6 exhibiting independence with su but suggesting that Dt6 is proximal to su.
G. F. Sprague
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