Studies on Crossing Over in Homozygous and Heterozygous Chromosomes Rearrangements in Zea mays

Citation

Patterson, Earl Byron (1952) Studies on Crossing Over in Homozygous and Heterozygous Chromosomes Rearrangements in Zea mays. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/MGE7-G829. https://resolver.caltech.edu/CaltechTHESIS:08302017-140323046

Abstract

The nature and behavior of chromosome inversions and translocations are discussed and the literature reviewed. Their uses in cytogenetic and biochemical studies are also outlined and applications are cited.

Linkage data are presented for the genetic positions of sixteen translocations in chromosomes 9 with reference to the marker genes C, sh₁, and wx. Data are also presented for the map positions of fourteen translocations in chromosome 2, with reference to the genes lg₁, gl₂, B, sk₁, and v₄. The uses of duplicate-deficient gametes and pollen grains in cytogenetic investigations are outlined and their applications to these studies are described. Techniques for the classification and transmission of unbalanced chromosome complements are presented and the phenotypic effects of certain gene dosages are described. Available information on each of the thirty translocations mentioned above is summarized and its bearing on previous information regarding chromosomes 2 and 9 is discussed.

Studies are also reported in which the lg₁-gl₂ and C-wx regions are moved to different positions in the chromosome complement. Changes of position were brought about by using chromosome rearrangements. In each case, the crossover value is measured in the homozygous rearrangement and is compared with the crossover value found when the region is in its standard position. In some cases recombination values from female and male transmission are also compared.

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