Linkage Values in an Interchange Complex in Zea

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Abstract
A reciprocal trans-location, semi-sterile 4, involved the pr-v 2 and lg-b-ts 1 linkage groups. The %% of crossing-over between ts 1, b and lg with the point of interchange in the b-lg chromosome are 4, 22 and 47, respectively. The loci of pr and V 2 are 18 and 46 crossover units distant from the break in the pr-v 2 chromosome. Cultures segregating for the genes b and pr and for the interchanged chromosomes show approximately 31% of crossing over between b and pr. This is the first case, in Zea, of inter-chromosomal linkage. The frequency of double crossovers between b, the point of interchange, and pr indicate the absence of interference in crossing-over in these two regions.

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