From Bikram Gill, 12/92 ANEUPLOIDS INVOLVING ONE CHROMOSOME/According to Kimber/Sears Nullisomic a plant with 20 homologous bivalents or a plant deficient for one chromosome pair. Symbol: 20" Somatic chromosome number: 40 Monosomic a plant with 20 homologous bivalents and one univalent for a complete chromosome. Symbol: 20"+1 Somatic chromosome number: 41 Disomic a plant with the euploid chromosome complement of Triticum aestivum present as 42 complete chromosomes. Symbol: 21" Somatic chromosome number: 42 Trisomic a plant with one complete chromosome represented three times. Symbol: 20"+1" Somatic chromosome number: 43 Tetrasomic a plant with one complete chromosome represented four times. Symbol: 20"+1"" Somatic chromosome number: 44 Monotelosomic a plant with one chromosome represented by a telocentric misdivision product for one complete chromosome arm. Symbol: 20"+1 Somatic chromosome number: 41 Ditelosomic a plant with one chromosome represented by a homologous pair of telocentric chromosomes Symbol: 20"+1" Somatic chromosome number: 42 Tritelosomic a plant with one chromosome represented by three homologous telocentric chromosomes Symbol: 20:+1" Somatic chromosome number: 43 Monotelodisomic a plant with one chromosome represented by a bivalent consisting of a complete and a telocentric chromosome. This type of bivalent is often referred to as a heteromorphic bivalent. Symbol: 20"+1" Somatic chromosome number: 42 Monotelotrisomic a plant with one chromosome represented by a trivalent consisting of two complete chromosomes and one telocentric chromosome. Symbol: 20"+t2" Somatic chromosome number: 43 Ditelotrisomic a plant with one chromosome represented by a trivalent consisting of two homologous telocentric chromosomes and one complete chromosome. Symbol: 20"+(t")1" Somatic chromosome number: 43 Monoisosomic a plant with one chromosome represented by an isochromosome misdivision product for one complete arm. Symbol: 20"+i Somatic chromosome number: 41 Di-isosomic a plant with one chromosome represented by a homologous pair of isochromosomes. Symbol: 20"+i" Somatic chromosome number: 42 Tri-isosomic a plant with one chromosome represented by three homologous isochromosomes. Symbol: 20"+i" Somatic chromosome number: 43 Monoisodisomic a plant with one chromosome represented by a bivalent consisting of a complete chromosome and an isochromosome. Symbol: 20"+i1" Somatic chromosome number: 42 Monoisotrisomic a plant with one chromosome represented by a trivalent consisting of two complete chromosome and one isochromosome. Symbol: 20"+i2" Somatic chromosome number: 43 Di-isotrisomic a plant with one chromosome represented by a trivalent consisting of two homologous isochromosomes and one complete chromosome. Symbol: 20"+(i")1" Somatic chromosome number: 43 Teloisodisomic a plant with one chromosome represented by a telocentric chromosome and its homologous isochromosome. Symbol: 20"+ti" Somatic chromosome number: 42 Monotelomonoisosomic a plant with one chromosome represented by a telocentric chromosome for one arm and an isochromosome of the other, non-homoeologous arm. Symbol: 20"+t +i Somatic chromosome number: 42 Doublemonotelosomic a plant with one chromosome represented by a telocentric chromosome for each arm. Symbol: 20"+t +t Somatic chromosome number: 42 Ditelo-monotelosomic a plant with one chromosome represented by a pair of telocentric chromosomes for one arm and an unpaired telocentric chromosome for the other, non-homologous, arm. Symbol: 20"+t"+t Somatic chromosome number: 43 Doubletelotrisomic a plant with one chromosome represented by a trivalent consisting of a complete chromosome and two telocentric chromosomes, one for each arm of the complete chromosome. Symbol: 20"+(t+t)1" Somatic chromosome number: 43 Doublemonoisosomic a plant with one chromosome represented by two isochromosomes, one for each arm. Symbol: 20"+i +i Somatic chromosome number: 42 Doubleisotrisomic a plant with one chromosome represented by a trivalent consisting of a complete chromosome and two isochromosomes, one for each arm of the complete chromosome. Symbol: 20"+(i+i)1" Somatic chromosome number: 43 Teloisotrisomic a plant with one chromosome represented as a trivalent consisting of a complete chromosome, and isochromosome, and a telocentric chromosome for the same arm as the isochromosome. Symbol: 20"+(ti)1" Somatic chromosome number: 43 Monotelo-monoisotrisomic a plant with one chromosome represented as a trivalent consisting of a complete chromosome, an isochromosome, and a telocentric chromosome for the other, non-homologous arm. Symbol: 20"+(t+i)1" Somatic chromosome number: 43 Ditelo-monoisosomic a plant with one chromosome represented by a pair of telocentric chromosome for one arm and an unpaired isochromosome for the other, non-homologous arm. Symbol: 20"+t"+i Somatic chromosome number: 43 Double ditelosomic a plant with the euploid chromosome complement of Triticum aestivum with one chromosome represented by a pair of telocentric chromosomes for each arm. Symbol: 20"+t"+t" Somatic chromosome number: 44 ANEUPLOIDS INVOLVING MORE THAN ONE CHROMOSOME Compensating nullisomic-tetrasomics a plant that is nullisomic for one chromosome and tetrasomic for a chromosome belonging to the same homoeologous group. Symbol: 19"+1"" Somatic chromosome number: 42 Compensating monosomic-tetrasomics a plant that is monosomic for one chromosome and tetrasomic for a chromosome belonging to the same homoeologous group. Symbol: 19"+1""+1 Somatic chromosome number: 43 Compensating nullisomic-trisomics a plant that is nullisomic for one chromosome and trisomic for a chromosome belonging to the same homoeologous group. Symbol: 19"+1" Somatic chromosome number: 41 Double monosomics a plant that is monosomic for two non-homologous chromosomes. Symbol: 19"+1 +1 Somatic chromosome number: 40 ANEUPLOIDS INVOLVING ONE TRITICUM AESTIVUM CHROMOSOME AND ONE CHROMOSOME FROM A DONOR SPECIES Chromosome addition a plant that has one chromosome/chromosome arm or one pair of chromosomes/chromosome arms from a related species added to the euploid chromosome complement of Triticum aestivum. Symbols: monosomic addition 21"+1" monotelosomic addition 21"+t Somatic chromosome number: 43 disomic addition 21"+1" ditelosomic addition 21+t" Somatic chromosome number: 44 Chromosome substitution plant that is monosomic or nullisomic for one triticum aestivum chromosome/chromosome arm and has one chromosome/chromosome arm or one pair of chromosomes/chromosome arms from a different variety of Triticum aestivum or from a related species. Symbols: monosomic substitution 20"+1 +1 monotelosomic substitution 20"+1 +t disomic substitution 20"+1" ditelosomic substitution 20+t" Somatic chromosome number: 42