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Karyotype Evolution in Tilapia: Mitotic and Meiotic Chromosome Analysis of Oreochromis Karongae and O. Niloticus × O. Karongae Hybrids

Citation
Harvey SC, Campos-Ramos R, Kennedy DD, Ezaz MT, Bromage NR, Griffin DK & Penman D (2002) Karyotype Evolution in Tilapia: Mitotic and Meiotic Chromosome Analysis of Oreochromis Karongae and O. Niloticus × O. Karongae Hybrids, Genetica, 115 (2), pp. 169-177.

Abstract
The karyotype of Oreochromis species is considered to be highly conserved, with a diploid chromosome complement of 2n = 44. Here we show, by analysis of mitotic and meiotic chromosomes, that the karyotype of O. karongae, one of the Lake Malawi ‘chambo' species, is 2n = 38. This difference in chromosome number does not prevent the production of inter-specific hybrids between O. niloticus (2n = 44) and O. karongae (2n = 38). Analysis of the meiotic chromosomes of the O. niloticus × O. karongae hybrids indicates that three separate chromosome fusion events have occurred in O. karongae. Comparison of the O. karongae and O. niloticus karyotypes suggests that these consist of one Robertsonian fusion and two fusions of a more complex nature.

Keywords
chromosome evolution; chromosome fusion; hybridisation; synaptonemal complex; Tilapia

StatusPublished
AuthorsHarvey Simon C, Campos-Ramos Rafael, Kennedy D D, Ezaz M Tariq, Bromage Niall R, Griffin Darren K, Penman David
Publication date06/2002
PublisherSpringer
ISSN 0016-6707
LanguageEnglish

Journal
Genetica: Volume 115, Issue 2

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