chromosome number

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chromosome number

the number of CHROMOSOMES found in a cell, usually in the diploid state; thus humans have a chromosome number of 46, made up of 23 pairs.
References in periodicals archive ?
Rates of evolution in seed plants: Net increase in diversity of chromosome numbers and species numbers through time (polyploidy/aneuploidy/population structure/speciation/fossil record).
Haliotidae most likely originated from abalones inhabiting the ancient Tethys Sea and based on chromosome number (the Tethys model), the family is classified into two different lineages (Geiger & Groves 1999, Franchini et al.
Aneuploidy is an error in cell division whereby the resulting daughter cells contain the incorrect chromosome number, either extra or less.
Table 1: Chromosome numbers in cells of the studied aspen clones.
All species studied to date show a diploid chromosome number of 2n = 38 [6, 7] and their karyotypes are mostly composed of chromosome pairs showing small differences in size and morphology, therefore making their accurate identification almost impossible [7].
The chromosome numbers of examined taxa were given previously (Kocyigit et al.
Chromosome numbers of some species of Passiflora occurring in Hawaii.
Kinetic organization of metaphase I bivalents in spermatogenesis of Lepidoptera and Trichoptera species with small chromosome numbers. Heredity 79: 135-143.
The first phase that predominantly focused on the determination of chromosome number started with the finding of two Vitis species (OLMO, 1937) and has continued until now mainly regarding the detection of chromosome duplication, which either may appear spontaneously, or might be induced by chemical agents or may also appear in plants regenerated through tissue culture (KUKSOVA et al., 1997).
The basic chromosome numbers in the genus are n = 5 6 and (Maxted et al.
The older literature indicates possibly 5 chromosomes in some of the freshwater Vaucheria species, but other chromosome numbers have been reported also (Gross, 1937).
[6] "Index to Plant Chromosome Numbers (IPCN)," http://www .tropicos.org/Project/IPCN.

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