It is a
tetrasomic rootstock developed by the crossing of the diploid guava 'Allahabad Safeda' with a triploid without seeds.
FISH analysis with AML1/ETO revealed
tetrasomic signals for ETO (8q21) in 5.5% of the cells analyzed (Fig.
Potato is an autotetraploid with four copies of the same genome and shows
tetrasomic inheritance, a characteristic shared by many other important crops including leek, sugarcane, alfalfa and some economically important aquaculture species, including Atlantic salmon and trout.
Based on anecdotal evidence, a positive criterion of 10
tetrasomic cells was recommended, and this approach was first adopted for scoring bladder washings.
tetrasomic inheritance (Howard, 1970; Ross, 1986; Hawkes, 1990).
Nullisomic,
tetrasomic, nulli-tetrasomic, and ditelocentric series lines showed that high molecular weight glutenin are controlled by the loci on long arm of 1A, 1B, and 1D chromosomes near centrometer (recombination index = 9%) [2].
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).
However, plants with glaucous blue leaves appeared in the advanced generations, [C.sub.1] and [C.sub.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 locus.
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.
coupling-phase within each linkage group would indicate allopolyploidy (disomic inheritance), and a 0.25:1 ratio would indicate autopolyploidy (
tetrasomic inheritance).
