Archive image from page 206 of Cytology (1961). Cytology cytology00wils Year: 1961 seem to account very well for the range of chromosome numbers in Crepis (Babcock, 1947) especially since interspecific hybrids between species with n = 4 and n = 3 show the latter to have a chromosome partially homologous to two in the former. There is also a good deal of Figure 8-7. Photomicrograph of Ring of 12 Chromosomes in Rhoeo discolor Produced as the Result of Multiple Translocation. (From Darlington, C. D. and LaCour. L. F., 1960. 'The Handling of Chromosomes,' 3rd ed., George Allen & Unwin. Ltd.,
Archive image from page 206 of Cytology (1961). Cytology cytology00wils Year: 1961 seem to account very well for the range of chromosome numbers in Crepis (Babcock, 1947) especially since interspecific hybrids between species with n = 4 and n = 3 show the latter to have a chromosome partially homologous to two in the former. There is also a good deal of Figure 8-7. Photomicrograph of Ring of 12 Chromosomes in Rhoeo discolor Produced as the Result of Multiple Translocation. (From Darlington, C. D. and LaCour. L. F., 1960. 'The Handling of Chromosomes,' 3rd ed., George Allen & Unwin. Ltd., London, England, Plate XVIL) evidence that similar translocations have played a phylogenetic role in many animals, especially in grasshoppers, some Diptera, and probably in certain beetles such as the weevils (Smith, 1956). Indeed, much of the diflference in basic chromosome number between related species, so conspicuous in many animal groups, may ultimately be explained by such 'whole arm' exchange. CYTOGENETICS / 187
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