General cytogenetics / J. Sybenga.

  • Sybenga, J. (Jacob), 1926-
Date:
1972
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: General cytogenetics / J. Sybenga. Source: Wellcome Collection.

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    54 General cytogenetics §1.5 KASHMIRICA 100 SIBIRICA I И • • « 11М I • • 11 Mill 46 MUNGIERI 38 LEOWTODON- TOIDES C0WY2AEF0LIA 71 CAPILLARIS 38 l' I I « I M' 21 SUFFRENIANA 22 FULIGINOSA Fig.1.20. Simplified idiograms of eight species of Crepis. The relative genome length (C kashmirica = 100) is shown. Evolutionary development is accompanied by reduction in chromosome number (top to bottom) and size (left to right). According to Babcock et al., 1942. tain that deviations from the established type only very infre¬ quently are an improvement, and consequently will gradually or rapidly be eliminated. Occasionally, within a species polymor¬ phism in respect to number and chromosome structure is found. This means that more than one type can be satisfactory. The con¬ stant, characteristic haploid set of chromosomes of a species is the karyotype. The graphical representation of the karyotype is the idiogram (fig. 1.20). It contains information on the length of the A