c-m888104 - Determination of autonomous-mutability

--Peter A. Peterson

When mutable alleles give a high frequency of colorless derivatives in testcrosses, there is a suspicion that the control is by many functional elements on a reporter allele. When a receptive allele is isolated, the suspicion is confirmed. Another tack to test the distribution-of-many-elements concept is to test the residual progeny for the element.

Since c-m888104 is En-controlled, the colored progeny from the cross of C/c-m x c sh wx were crossed by the En reporter c-m(r). In 11 tests in two families no En were detected. This would support the contention that c-m888104 is autonomously mutable and the high frequency of colorless derivatives are derivative products from this allele.

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