Structural differentiation of the meiotic and mitotic chromosomes of the salamander,Ambystoma macrodactylum |
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| Authors: | James Kezer Pedro E León Stanley K Sessions |
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| Institution: | (1) Department of Biology, University of Oregon, 97403 Eugene, Oregon, USA;(2) Centro de Investigaciones en Biología Celular y Molecular, Universidad de Costa Rica, Ciudad Universitaria, Costa Rica, America Central;(3) Museum of Vertebrate Zoology, University of California, 94720 Berkeley, California, USA |
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| Abstract: | The lampbrush chromosomes of the long-toed salamander, Ambystoma macrodactylum Baird, have been analysed and a map of the oocyte genome prepared. The location of C-bands and cold-induced-constrictions has been established in mitotic chromosomes and compared with the location of marker structures and chiasmata in several lampbrush bivalents. In the lampbrush chromosomes, C-bands are tentatively correlated with sphere-organizing loci and with regions of low chiasma frequency; cold-induced-constrictions are tentatively correlated with regions of high chiasma frequency. In general, in this salamander, C-bands do not coincide in position with cold-induced-constrictions. We have compared our results with those obtained by Callan (1966) in his investigation of chromosomes of the axolotl, Ambystoma mexicanum, and we present an analysis of the similarities and differences that are visible in the chromosome sets of these two ambystomatid species. |
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