. Grundsätze der modernen Biologie. Biologie. HEXAPLOID PENTAPLOID (35) (42) (56) Abb. OCTAPLOID. 26-30. Chromosom Gruppen verschiedener Arten von Rosen. Einige dieser Formen (die mit ungeraden Chromosomenzahlen, mindestens) sind wahrscheinlich Hybriden. (Nach Tackholm.) In solchen Arten. In der Tat eine ganze Anzahl von Arten, die in eng verwandten Pflanze Gruppen haben Chromosom Zahlen, die ein Vielfaches einer gemeinsamen Faktor (Abb. 26-30). In jedem tetraploiden Lager, spätere Verirrungen oc-curring über einen Zeitraum von vielen Jahren Ergebnis in der Produktion der anderen Aktien, Hexaploid sind (6n), octaploid (8n), ein

• Bildanbieter: The Book Worm / Alamy Stock Foto
• Bild-ID: RDYRXH
• Dateigröße: 7,1 MB (122,3 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 2023 x 1235 px | 34,3 x 20,9 cm | 13,5 x 8,2 inches | 150dpi

Weitere Informationen

Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel

. Principles of modern biology. Biology. PENTAPLOID (35) HEXAPLOID (42) OCTAPLOID (56) Fig. 26-30. Chromosome groups of different species of roses. Some of these forms (those with odd chromosome numbers, at least) are probably hybrids. (After Tackholm.) lished in such species. In fact quite a num- ber of species in closely related plant groups have chromosome numbers that are multiples of a common factor (Fig. 26-30). In any tetraploid stock, subsequent aberrations oc- curring over a period of many years may re- sult in the production of other stocks that are hexaploid (6n), octaploid (8n), and so forth. Other types of aberration, which also can be important in the origin of species, display quite a variety of forms (Fig. 26-31). Defi- ciencies, because of the loss of one chromo- some, or any fragment of a chromosome; duplications, as a result of the presence of an extra chromosome or any of its pieces; Fig. 26-31. Types of aberrations. In each case the normal chromosome is shown on the left, the abnormal one on the right. translocations, owing to the attachment of a piece to some other chromosome; and inver- sions, resulting from the rejoining, by the wrong ends, of two pieces of a single chro- mosome—all have important genetic conse- quences that have been studied very inten- sively in Drosophila. Irradiation of animals and plants with x-rays greatly increases the occurrence of such aberrations, since the x-ray treatment tends to produce a fragmen- tation of the chromosomes. Careful studies of the chromosomes of several closely related species have shown that the difference be- tween two species may, in some cases, arise suddenly by chromosomal aberration. In one case, for example, a single inversion occur- DEFICIENCY DUPLICATION. TRANSLOCATION INVERSION. 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 origi

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• bookcollectionbiodiversity
• buchsubjektbiologie