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Symbols for Chromosome Numbers
Nature, 1934IN a paper on the chromosomes of Chrysanthemum, Shimotomai1 pointed out the need for a special symbol to represent the basic number of chromosomes in genera containing polyploid species. He suggests, however, that n should be used for this purpose, and 2 being introduced as new symbols for the gametic and zygotic numbers of chromosomes respectively in ...
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Chromosome Numbers of Cerastium Species
Nature, 1950THE chromosomes of four species of Cerastium, namely, C. vulgatum, C. alpinum (including C. alpinum lanatum), C. arvense and C. perfoliatum, have been counted from root-tips of young seedlings. I give here a list of chromosome counts made by previous workers, none of which is of British material, together with my own counts.
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Chromosome Numbers of the Blattaria
Annals of the Entomological Society of America, 1970The numbers of chromosomes of 106 species (62 genera) of Blattaria are given; the numbers for 84 species are reported for the first time. The numbers vary greatly in the suborder and range from n ♀ = 8 to n ♀ = 40. Differences in number occur also between species of a given genus. The most frequently occurring haploid number is 19.
Samuel H. Cohen, Louis M. Roth
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Chromosome Numbers in Menispermaceæ
Nature, 1934IN a recent communication to NATURE1, entitled, “Origin of the Angiosperms”, Dr. Anderson puts forward the interesting suggestion of the possible origin of modern flowering plants through the Magnoliales from wide crosses between different groups of Gymnosperms showing 12 and 7 as the base number of their chromosomes, such as the modern Ginkgoales ...
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Chromosome numbers in the proteaceae
Australian Journal of Botany, 1963Chromosome numbers have been determined for 19 genera and 53 species of Proteaceae in Australia. The chromosomes are small in all genera except Persoonia n = 7, Placospermum n = 7 (Johnson and Briggs 1963) and Bellendena n = 5 (Venkata Rao 1957), which have chromosomes comparable in size with those in the Liliaceae and Ranunculaceae.
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Chromosome Morphology and Number
1998• A karyotype describes the chromosome complement of an individual or species in terms of number, size, and morphology of its chromosomes. • Karyotypes can be based on mitotic or meiotic chromosomes and are enhanced by chromosome-banding techniques.
Cedric E. May +3 more
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Chromosome numbers in the Casuarinaceae
Australian Journal of Botany, 1959Chromosome numbers of 37 species of Casuarina are reported, and found to conform with a suggested division of the genus into major species groups. The extra-Australian species groups are probably ancient, and are at the primary diploid level of the genus (x = 8 or 9).
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Variations in Chromosome Number
1987The creation of new plant genotypes through gene recombination was discussed in the two preceding chapters. In the conventional breeding procedure, gene recombinations are obtained by hybridizing varieties, or species, with different agronomic characteristics, and then selecting in the segregating generations for the genotype, or genotypes, with the ...
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