Shahin Adel A Basyouny, Ata Abdel Tawab Mohammed, Shnaf Anwaar S Mohammed Abu
Folia Biol (Krakow). 2014;62(1):49-58.
The karyotype and C-banding pattern of domestic Greylag geese Anser anser anser populations collected from five localities in El Minia, Egypt, that have either whitish grey or white feather color patterns were described. All populations have a diploid number of 2n= 80 chromosomes. Of the 80 chromosomes, 10 pairs, including ZW chromosomes, were macrochromosomes and the remaining 30 pairs were microchromosomes. Slight variation in the size of macrochromosomes was observed amongst populations. However, obvious variation of C-banding distribution was found and attributed to variation of euchromatin content and its correlation with chromosome size and arrangement of constitutive heterochromatin. Nevertheless, significant variation in the mean number of C-heterochromatin blocks in microchromosomes was attributed to either transformation of heterochromatin into euchromatin and vice versa or to involvement of structural chromosomal aberrations during karyotype evolution. The present results show that A. anser populations common in Egypt could be distinguished from those of A. anser and A. cygnoides occurring elsewhere in Europe and Asiaviavariability in chromosome morphology of pairs nos. 2, 3 and 4.
描述了从埃及明亚五个地区收集的具有灰白色或白色羽毛颜色模式的家养灰雁种群的核型和C带模式。所有种群的二倍体数目均为2n = 80条染色体。在这80条染色体中，包括ZW染色体在内的10对为大染色体，其余30对为小染色体。在不同种群中观察到了大染色体大小的轻微差异。然而，发现C带分布存在明显差异，这归因于常染色质含量的差异及其与染色体大小和组成型异染色质排列的相关性。尽管如此，小染色体中C - 异染色质块平均数量的显著差异归因于异染色质与常染色质之间的相互转化，或者归因于核型进化过程中染色体结构畸变的参与。目前的结果表明，通过第2、3和4对染色体形态的变异性，可以将埃及常见的灰雁种群与欧洲和亚洲其他地方的灰雁和鸿雁区分开来。
