Diploidization, which follows whole genome duplication events, does not occur evenly across the genome. In salmonid fishes, certain pairs of homeologous chromosomes preserve tetraploid loci in higher frequencies toward the telomeres due to residual tetrasomic inheritance. Research suggests this occurs only in homeologous pairs where one chromosome arm has undergone a fusion event. We present a ...

We report the first detailed genetic linkage map of rainbow trout (Oncorhynchus mykiss). The segregation analysis was performed using 76 doubled haploid rainbow trout produced by androgenesis from a hybrid between the "OSU" and "Arlee" androgenetically derived homozygous lines. Four hundred and seventy-six markers segregated into 31 major linkage groups and 11 small groups (< 5 markers/group). ...

The availability of reliable genetic linkage maps is crucial for functional and evolutionary genomic analyses. Established theory and methods of genetic linkage analysis have made map construction a routine exercise in diploids. However, many evolutionarily, ecologically, and/or agronomically important species are autopolyploids, with autotetraploidy being a typical example. These species under...

Polyploid plants are formed when numerically unreduced (2n) gametes participate in fertilization. Based on cytological and genetic analyses, modes of 2n gamete formation have been determined for a number of plant species. Gametes formed by a first-division restitution (FDR) mechanism contain nonsister chromatids near the centromere, whereas those formed by second-division restitution (SDR) cont...

Polyploidization as the consequence of 2n gamete formation is a prominent mechanism in plant evolution. Studying its effects on the genome, and on genome expression, has both basic and applied interest. We crossed two diploid (2n = 2x = 16) Medicago sativa plants, a subsp. falcata seed parent, and a coerulea × falcata pollen parent that form a mixture of n and 2n eggs and pollen, respectively. ...

Journal 01 Heredity 1988;79:377-384; OI)~2-1503!88!$2.00 Horizontal starch gel electrophoresis was used to pertorm genetic analysis to confirm the inheritance of various isozyme loci and report on additional loci in diploid Solanum species. Aps-I, Dis-I, and Idh-1 were identified as new loci, and tetrasomic seg­ regati on was reported at the tetraploid level for Mdh-2. Of 15 loci stu died, d Is...