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Genetic distances across the a1-sh2 interval varied threefold in three near-isogenic stocks that carry structurally distinct teosinte A1 Sh2 haplotypes (from Z. mays spp. mexicana Chalco, Z. mays spp. parviglumis, and Z. luxurians) and a common maize a1::rdt sh2 haplotype. In each haplotype &gt;85% of recombination events resolved in the proximal 10% of the approximately 130-kb a1-sh2 interval. Even so, significant differences in the distributions of recombination breakpoints were observed across subintervals among haplotypes. Each of the three previously detected recombination hot spots was detected in at least one of the three teosinte haplotypes and two of these hot spots were not detected in at least one teosinte haplotype. Moreover, novel hot spots were detected in two teosinte haplotypes. Due to the near-isogenic nature of the three stocks, the observed variation in the distribution of recombination events is the consequence of cis-modifications. Although generally negatively correlated with rates of recombination per megabase, levels of sequence polymorphisms do not fully account for the nonrandom distribution of recombination breakpoints. This study also suggests that estimates of linkage disequilibrium must be interpreted with caution when considering whether a gene has been under selection.

genetics

<i>Cis</i>-effects on Meiotic Recombination Across Distinct <i>a1-sh2</i> Intervals in a Common Zea Genetic BackgroundSequence data from this article have been deposited with the EMBL/GenBank Data Libraries under accession nos. AY656756, AY656757, AY656758 and AY662984, AY662985, AY662986, AY662987.

Cis-effects on Meiotic Recombination Across Distinct a1-sh2 Intervals in a Common Zea Genetic BackgroundSequence data from this article have been deposited with the EMBL/GenBank Data Libraries under accession nos. AY656756, AY656757, AY656758 and AY662984, AY662985, AY662986, AY662987.