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The genetic analysis of self incompatible plants genetic models 1. expected frequencies of genotypes in test crosses for monogenic inherited characters linked to s loci for plants with the gametophyte type to self incompatibility



The genetic analysis of self incompatible plants genetic models 1. expected frequencies of genotypes in test crosses for monogenic inherited characters linked to s loci for plants with the gametophyte type to self incompatibility



Genetika 24(4): 698-707



Three models have been put forward to describe segregation for marker genes linked to S genes in progenies of test crosses for plants with the gametophyte types of self-incompatibility. The cases are considered when partial cross compatibility exists between plants. Model 1 describes segregation for one marker gene linked to S locus. It follows that theoretical frequencies of genotypes in progenies of test crosses are determined: (a) by the recombination coefficient between a marker and S locus; (b) by the number of S loci responsible for partial plant cross-compatibility. Model 2 describes expected frequencies for two markers linked to S locus, in progenies of test crosses, considering two patterns of marker arrangement in the chromosome, in relation to S lecus: (a) both markers are situated on one side of S locus; (b) the markers are situated on both sides of S locus. The frequencies of genotypes in progenies of test crosses for digenic segregation depend on: (a) recombination coefficient between markers and S locus; (b) the number of S loci responsible for the partial cross compatibility; (c) markers arrangement in the chromosome relatively to S locus. Model 3 describes segregation for two markers localized in two chromosomes and linked to two S loci. The theoretical frequencies in progenies of test crosses for digenic segregation depend on: (a) recombination coefficients between markers and S loci; (b) the number of S loci which determine partial cross compatibility between plants. Linkage of two markers to one or two S loci results in the change of frequencies of genotypes in the progenies of test crosses, i.e. S loci induced the effects of pseudo-linkage and pseudo-repulsion of genes. These effects arise as a result of the activity of S genes which prevent self-fertilization in plants and are named functional linkage and functional repulsion.

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