. Botany of the living plant. Botany; Plants. kin I w A B q Cz c3 d) d2 d3 0I4 ,. till IllilfMf A B C| C2C3c^c^c^oU Fig. 434. Somatic chromosome complements (karyotypes) of three species of Muscari— M. longipes, M. tenuiflorum and M. monstrosum. (From Sharp's Introduction to Cytology, by courtesy of the McGraw-Hill Book Co., Inc. After Delaunay, 1926.) the one hand, and taxonomic position or grade of evolution on the' other, at any rate in so far as the major taxonomic groups are con- cerned. The constancy of the chromosome number, however, is im- portant as evidence th
. Botany of the living plant. Botany; Plants. kin I w A B q Cz c3 d) d2 d3 0I4 ,. till IllilfMf A B C| C2C3c^c^c^oU Fig. 434. Somatic chromosome complements (karyotypes) of three species of Muscari— M. longipes, M. tenuiflorum and M. monstrosum. (From Sharp's Introduction to Cytology, by courtesy of the McGraw-Hill Book Co., Inc. After Delaunay, 1926.) the one hand, and taxonomic position or grade of evolution on the' other, at any rate in so far as the major taxonomic groups are con- cerned. The constancy of the chromosome number, however, is im- portant as evidence that the chromosomes, though not ordinarily distinguishable as such except at nuclear division, do nevertheless retain their individuality during the resting stage. Further support for this view is provided by the many cases in which the several pairs of chromosomes are visibly— morphologically—distinct; an example is shown in Fig. 434. The type of chromosome complement characteristic of a race or individual has been termed its karyotype. Comparison of karyotypes within limited circles of affinity has thrown light on problems of taxonomy and evolution (see below under " poly- ploidy," pp. 581-584). Hybridisation. If the gametes involved in producing a succession of generations were uniform throughout in their origin and hereditary constitution, the organisms produced might be expected to remain constant. But the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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