The reduction of genic activity in the tetraploid amphibianOdontophrynus americanus is not due to loss of ribosomal DNA |
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| Authors: | J Schmidtke W Beçak W Engel |
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| Institution: | (1) Institut für Humangenetik und Anthropologie der Universität, Albertstrasse 11, D-78 Freiburg im Breisgau, German Federal Republic, BRD;(2) Present address: Serviço de Genética, Instituto Butantan, São Paulo, Brasil |
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| Abstract: | Summary Genic activity in tetraploid members of the amphibian speciesOdontophrymus americanus is reduced to that of diploid ones. Loss of ribosomal genes, a mechanism suggested by others as a means of decreasing genetic activity, could be ruled out. The diploids and the tetraploids have almost identical proportions of their genomes complementary to (28s+18s) ribosomal RNA. |
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