Concerning Paths That Do Not Separate a Given Continuous by Moore R. L.

By Moore R. L.

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It has been stated repeatedly that the success of polyploids in nature would be dependent upon the maintenance of hybridity (Barber, 1970; Tal, 1980, Stebbins, 1980). In baker's yeast it has been shown that heterozygosity allied with polyploidy results in increased rates of fermentation and that this increase can be attributed to heterosis or increased heterozygosity, rather than the physical increment in cellular volume (Takagi et al, 1983). Polysomic inheritance would result in larger heterozygosity in autopolyploids, relative to their diploid counterparts (Muller, 1914; Haldane, 1930; Barber, 1970; Stebbins, 1950, 1980).

And its presumed progenitor (S. robustum Brandes & Jesw. ex Grassl). Mol Breed (in press) Smith HH (1937): The relation between genes affecting size and color in certain species of Nicotiana. Genetics 22:361 Sobral BWS, Honeycutt RJ (1993): High output genetic mapping in polyploids using PCR-generated markers. Theor Appl Genet 86: 105-112 Sobral BWS, Honeycutt RJ (1994): Genetics, plants, and the polymerase chain reaction. In: The Polymerase Chain Reaction, Mullis KB, Ferre F, Gibbs A eds. Boston: Birkhauser 34 DA SILVA AND SOBRAL Sobral BWS, Braga DPV, LaHood ES, Keirn P (1994): Phylogenetic analysis of chloroplast restriction enzyme site mutations in the Saccharinae Griseb.

This would be consistent with few mutations being responsible for the phenotypic differences between S. robustum and S. officinarum. However, mapping single-dose markers in the F 1 progeny of a cross of heterozygous parents maximizes linkage disequilibrium such that markers represent large genomic regions. Thus, more than one QTL may be represented by a single marker, thereby causing an underestimation of the number of effective factors, and the concomitant incorrect attribution of effects to single loci (Edwards et al, 1987).

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