. Cytological studies of five interspecific hybrids of Crepis leontodontoides. Karyokinesis; Crepis. Fig. 12. Meiosis in Ft C. leontodontoides-marsclialli. a, I-M, with no bivalents, three of the marschalli chromosomes appear larger than the rest; b, I—A; c, diakinesis with nine unpaired chromosomes; d, late diaki- nesis with one bivalent and seven univalents, one with a satellite on the nucleolus; e, I-M, with two bivalents; f, I-M, with three bivalents. Meiosis In PMC's of the hybrid the same size relations are found, three large and six smaller units being evident at I-M where no pairing oc

. Cytological studies of five interspecific hybrids of Crepis leontodontoides. Karyokinesis; Crepis. Fig. 12. Meiosis in Ft C. leontodontoides-marsclialli. a, I-M, with no bivalents, three of the marschalli chromosomes appear larger than the rest; b, I—A; c, diakinesis with nine unpaired chromosomes; d, late diaki- nesis with one bivalent and seven univalents, one with a satellite on the nucleolus; e, I-M, with two bivalents; f, I-M, with three bivalents. Meiosis In PMC's of the hybrid the same size relations are found, three large and six smaller units being evident at I-M where no pairing oc Stock Photo

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. Cytological studies of five interspecific hybrids of Crepis leontodontoides. Karyokinesis; Crepis. Fig. 12. Meiosis in Ft C. leontodontoides-marsclialli. a, I-M, with no bivalents, three of the marschalli chromosomes appear larger than the rest; b, I—A; c, diakinesis with nine unpaired chromosomes; d, late diaki- nesis with one bivalent and seven univalents, one with a satellite on the nucleolus; e, I-M, with two bivalents; f, I-M, with three bivalents. Meiosis In PMC's of the hybrid the same size relations are found, three large and six smaller units being evident at I-M where no pairing occurs (figs. 12a and 126). No pairing of the nine chromosomes is. 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 work.. Avery, Priscilla, 1899-1939. Berkeley, California, University of California press

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RMW22HGW–Archive image from page 18 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930

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RMW22HFM–Archive image from page 18 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930 1930] Avery: Hybrids of Crepis leontodontoides 151 again disappears in this hybrid. In figure 11 a somatic plate from a rather old root is shown. Here all the chromosomes are contracted so that the individuality of the leontodontoides chromosomes is not evi- dent, but the distinction between the parental sets is obvious.

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RMW22E00–Archive image from page 12 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930 1930] Avery: Hybrids of Crepis leontodontoides 145 lite on a long thread, and is thus easily identified. The D-chroinosome of leontodontoides loses its satellite, as in the hybrid with tectorum. The c-chromosonie of parviflora is so similar to the B-chromosome of leontodontoides in morphology that distinction between the two is not usually possible (fig. 6).

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RMW2709H–Archive image from page 29 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930 162 University of California Publications in Agricultural Sciences [Vol. 6 location, deletion, duplication, union, and fragmentation, which have been observed to occur both under natural conditions and after sub- jection to high frequency radiations in Drosophila and Datura. An illustration of the extent of the change in a chromosome com- plement which these processes might produce if operating over long periods

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RMW26XB1–Archive image from page 4 of Cytological studies of five interspecific. Cytological studies of five interspecific hybrids of Crepis leontodontoides cytologicalstudi65aver Year: 1930 1930] Avery: Hybrids of Crepis leontodontoides 137 with C. leontodontoides were obtained. C. aurea is the only species of the subgenus Catonia with which hybrids were secured, although extensive crosses were made with C. tingitana. ¥1 hybrids were also secured with the Barkliausia species C. marschaUi. In every case the F1 hybrids possessed features characteristic of each of the two parental species. In three cas