✦ LIBER ✦

Gene action in fish of tetraploid origin. IV. Ribosomal DNA amount in clupeoid and salmonoid fish

✍ Scribed by J. Schmidtke; M. T. Zenzes; C. Weiler; K. Bross; W. Engel

Publisher: Springer
Year: 1976
Tongue: English
Weight: 253 KB
Volume: 14
Category: Article
ISSN: 0006-2928
DOI: 10.1007/bf00484768

No coin nor oath required. For personal study only.

✦ Synopsis

PhylogeneticalIy tetraploid species of the fish order Isospondyli generally have twice the mean ribosomal gene content as closely related species on the phylogenetically diploid level. Considerable intraspecific variation of rDNA amount was observed. These findings are discussed in view of the hypothesis that selective loss of ribosomal genes may account for diminishing genie activity in phylogenetically tetraploid organisms.

📜 SIMILAR VOLUMES

Gene action in fish of tetraploid origin

Gene action in fish of tetraploid origin. II. Cellular and biochemical parameters in clupeoid and salmonoid fish

✍ J. Schmidtke; N. B. Atkin; W. Engel 📂 Article 📅 1975 🏛 Springer 🌐 English ⚖ 344 KB

By use of cell size, protein and hemoglobin content, and enzyme activities as markers, it becomes apparent that in the course of evolution the gene expression of anciently tetraploid fish of the order Ostariophysi was diploidized, but no such regulatory mechanism has evolved in the phylogenetically

Gene action in fish of tetraploid origin

Gene action in fish of tetraploid origin. III. Ribosomal DNA amount in cyprinid fish

✍ J. Schmidtke; W. Engel 📂 Article 📅 1976 🏛 Springer 🌐 English ⚖ 330 KB

Phylogenetically diploid and tetraploid cyprinid fish species have cells of very similar volumes and protein contents. This finding has prompted us to postulate a regulatory system established during the evolution of the tetraploids leading to a diploid state of genic expression. It was proposed tha

Gene action in fish of tetraploid origin

Gene action in fish of tetraploid origin. V. Cellular RNA and protein content and enzyme activities in cyprinid, clupeoid, and salmonoid species

✍ J. Schmidtke; B. Schulte; P. Kuhl; W. Engel 📂 Article 📅 1976 🏛 Springer 🌐 English ⚖ 330 KB

The ratio of cellular RNA and protein content is about 1:1 between phylogenetically diploid and tetraploid species of the teleost family Cyprinidae, but is roughly in proportion to ploidy in species of the teleost order Isospondyli. Enzyme activities do not unequivocally comply with this scheme. The

Gene action in fish of tetraploid origin

Gene action in fish of tetraploid origin. I. Cellular and biochemical parameters in cyprinid fish

✍ Jörg Schmidtke; Wolfgang Engel 📂 Article 📅 1975 🏛 Springer 🌐 English ⚖ 369 KB

In phylogenetically diploid and tetrapIoid Cyprinid fish species, erythrocyte volumes, protein contents, and mean activities of the enzymes LDH, 6PGD, and PGI per cell per active gene locus decline with increasing DNA contents. These findings are assumed to reflect an evolutionary tendency of poIypl