THE TRANSPOSABLE ELEMENT Ds AFFECTS THE PATTERN OF INTRAGENIC RECOMBINATION AT THE bz AND R LOCI IN MAIZE

1 Advanced Genetic Sciences, 6701 San Pablo, Oakland, California 94608
2 Department of Genetics, University of Wisconsin, Madison, Wisconsin 53706

Insertion of the transposable element Ds into either the bz or R locus affects intragenic recombination in various ways. We have examined here one aspect of this problem; namely, the distribution of flanking markers among intragenic recombinations produced by different types of heterozygotes carrying Ds insertion mutations. Heteroallelic combinations of a Ds insertion mutation and a mutation borne on a structurally normal chromosome generate a majority of intragenic recombinants of a crossover type. In contrast to this, most intragenic recombinants obtained from heterozygotes between two different Ds insertion mutations have a parental arrangement of outside markers. Therefore, the resolution of the recombination intermediate would appear to depend on the nature of the mutations in the heterozygote.

Submitted on May 17, 1985
Accepted on January 16, 1986




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