Based on anecdotal evidence, a positive criterion of 10 tetrasomic
cells was recommended, and this approach was first adopted for scoring bladder washings.
genetic analyses differ from those of diploids in two
The present study was conducted to map Randomly Amplified Polymorphic DNA primers (RAPDs) on homoeologous group 1 chromosomes (especially chromosome 1B of common wheat) of wheat genotypes "Chinese Spring" (CS) (which is euploid in nature, having genomes AABBDD, 2n=6x=42) and Nullisomic Tetrasomic
1B-1A (NT 1B1A).
2], following tetrasomic
segregation of the alleles governing the trait.
Allelic frequencies for isoloci were calculated as mean frequencies over both loci and treated as a single tetrasomic
However, after one generation of selfing, full homozygosity at a diploid heterozygous locus increases by 50%, while in tetraploids with tetrasomic
inheritance, full homozygosity (aaaa, AAAA) increases more slowly (17-21%, depending on the pattern of segregation) (Haldane 1930; Wright 1938; Parsons 1959).
salicaria shows tetrasomic
inheritance of tristyly at both loci (Fisher and Martin 1947; Fisher 1949; Fyfe 1953), we simulated a diploid genetic system for the sake of generality.
amp; Gray, that shows tetrasomic
inheritance, yet at MI forms only bivalents (Soltis & Rieseberg, 1986).
salicaria, the inheritance of both style morph loci is tetrasomic
, with no linkage or dosage effects (Fisher and Mather 1943; Fisher and Martin 1947).
Selection in a (auto)tetraploid may be more difficult due to tetrasomic
inheritance (Hayward & Breese, 1993; van Tuyl, 1993).
Genetic mapping at the diploid level avoids interpretation problems associated with tetrasomic
inheritance (Meyer et al.
Abbreviations: AHAS, acetohydroxyacid synthase; N6AT6B; Nullisomic 6A Tetrasomic
6B; N6BT6D, Nullisomic 6B Tetrasomic
6D; N6DT6A, Nullisomic 6D Tetrasomic
6A; DT6AS, Ditelosomic 6AS; DT6AL, Ditelosomic 6AL; DT6BS, Ditelosomic 6BS; DTBL, Ditelosomic 6BL; DT6DS, Ditelosomic 6DS; DT6DL, Ditelosomic 6DL.