because of limits in applicable karyological techniques and also the presence of a large number of small chromosomes in penaiedae family, the study on the number, structure, and the formula of the chromosomes in these shrimps is difficult. the present cytogenetic study was conducted on penaeus (fenneropenaeus) merguiensis native to persian gulf and oman sea by preparing spreads from various ear...

because of limits in applicable karyological techniques and also the presence of a large number of small chromosomes in penaiedae family, the study on the number, structure, and the formula of the chromosomes in these shrimps is difficult. the present cytogenetic study was conducted on penaeus (fenneropenaeus) merguiensis native to persian gulf and oman sea by preparing spreads from various ear...

Chromosome numbers and 2C-values of six Byblis species were determined to investigate the chromosome differentiation genome diversity in this genus. Somatic B. liniflora complex showed diploid tetraploid 2n=16 32. In contrast, number gigantea, which belongs gigantea complex, displayed only 2n=36. The 2C DNA contents across all studied over a three-fold range, from lowest value 2C=0.64 pg rorida...

The chromosomal spread and karyotype of Anjak (Schizocypris altidorsalis) from Hamoun Lake were determined using tissue squashing techniques with an injection of 1 mL/100 g body weight of 0.01% colchicines solution. Kidney and gill epithelia tissues were removed and used for karyotype analysis. The analysis of 145 chromosome spreads revealed the diploid chromosome number of this fish, 2n=48 and...

Abstract A karyotypic study was performed on 12 Iranian local onion (Allium cepa L.) populations. A number of mitotic cells at metaphase stage for each population were prepared. Chromosomes of suitable mitotic cells were counted and various parameters, including long arm (L), short arm (S), total length of chromosome (TL), relative length of chromosome (RL), arm ratio (AR), r-value, total chro...

Androgenesis in vitro is a basic method of obtaining haploid plants and DH (doubled haploid) lines major crops such as potato, rapeseed, tomato, pepper, wheat, maize, barley, also many different minor species with lower agricultural impact. Diploid appearing among androgenic regenerants are the effect spontaneous doubling chromosome number cells during an embryo’s early developmental stages val...

Diploids of the yeast Hansenula wingei are nonagglutinative and do not form zygotes in mixed cultures with either sexually agglutinative haploid mating type. However, a low frequency of diploid x haploid cell fusions (about 10(-3)) is detectable by prototrophic selection. This frequency of rare diploid x haploid matings is not increased after the diploid culture is induced for sexual agglutinat...

The chromosome constitution of early postimplantation presumptive haploid parthenogenetic mouse embryos was examined. All the embryos isolated were at the egg-cylinder stage and seven contained dividing cells. In two of the apparently healthy embryos only haploid mitoses were seen, whereas in five others an approximately equal proportion of haploid and diploid mitoses was observed. Out of 52 ce...