Accessory Chromosomes in Animals, Especially in Polycelis Tenuis

Melander, Yngve

doi:10.1111/j.1601-5223.1950.tb03361.x

Cited by 62 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the frequency of B chromosomes in parents might have been underestimated because of mitotic instability, as B chromosomes can be lost from somatic tissue but still be present in the germ line. Such mitotically unstable B chromosomes were found in grasshoppers ( Rothfels, 1950 ; Nur, 1969 ; Kayano, 1971 ; Pardo et al , 1994 ) and Polycelis tenuis ( Melander, 1950 ).…”

Section: Discussionmentioning

confidence: 99%

Intraspecific crosses resulting in the first occurrence of eight and nine B chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Voltolin

Senhorini²,

Foresti

et al. 2011

Genet. Mol. Biol.

View full text Add to dashboard Cite

B chromosomes are supernumerary elements present in about 15% of eukaryotic species and are most frequently heterochromatic, behave parasitically, show a transmission rate higher than standard (A) chromosomes, and can provoke harmful effects on carriers. In the current work, Prochilodus lineatus individuals carrying eight and nine B chromosomes were obtained by induced crossing performed involving breeders with different B chromosome numbers in their cells. The high B chromosome numbers found in the offspring were recorded for the first time in this species. The use of cytogenetic techniques applied in the present study revealed that regardless of the increase in number of B chromosomes in the genome of these individuals, those elements did not presented active genes, and showed their normal heterochromatic characteristic.

show abstract

Section: Discussionmentioning

confidence: 99%

Intraspecific crosses resulting in the first occurrence of eight and nine B chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Voltolin

Senhorini²,

Foresti

et al. 2011

Genet. Mol. Biol.

View full text Add to dashboard Cite

show abstract

“…Interactions between host B chromosomes and parasites have rarely been studied and then in very distant species. For instance, in the freshwater turbellarian Polycelis tenuis B chromosomes increased susceptibility to diseases (Melander, 1950), whereas harvestman ( Metagagrella tenuipes ) specimens with an odd number of Bs were more resistant to parasites (Gorlov and Tsurusaki, 2000). In this study, infrapopulations of H. polygyrus , S. stroma and T. muris in hosts with B chromosomes had more males than infrapopulations in hosts without Bs (fig.…”

Section: Discussionmentioning

confidence: 99%

Host B chromosomes as potential sex ratio distorters of intestinal nematode infrapopulations in the yellow-necked mouse (Apodemus flavicollis)

et al. 2018

View full text Add to dashboard Cite

The yellow-necked mouse, Apodemus flavicollis, can be considered as a model for genetic polymorphism produced by the frequent presence of supernumerary or B chromosomes (Bs). Host genetic background is rarely taken into account in studies of parasite sex ratio. The main aim of this study was to investigate the range of infrapopulation sex ratios for nematode parasites of the yellow-necked mouse and to determine which factors most influence variation in parasite sex ratios. Six nematode species found in the collected yellow-necked mice were analysed. We confirmed the predominant pattern of female-biased sex ratios in vertebrate parasite infrapopulations. The presence of B chromosomes in host genomes played an important role in infrapopulations of Heligmosomoides polygyrus, Syphacia stroma and Trichuris muris, as hosts with B chromosomes carried a higher proportion of males. The relative increase of males in infrapopulations could result from a shift in parasite life history strategy, induced by adaptation to the specific host genotypes (Bs present). In a meta-analysis with previously published data, the sex determination system was demonstrated to play a significant role in nematode sex ratio variation, as well as specific life history patterns, such as the place of egg hatching.

show abstract

“…The terminology used in this paper will refer to the extra chromosomes as accessory chromosomes (for an explanation; see MELANDER. 1950) and the remainder as the normal complement (normal chr.)…”

Section: Methodsmentioning

confidence: 99%

The Behavior of Accessory Chromosomes in Tetraploid Rye1

Sarvella

2010

Hereditas

View full text Add to dashboard Cite

Accessory Chromosomes in Animals, Especially in Polycelis Tenuis

Cited by 62 publications

References 24 publications

Intraspecific crosses resulting in the first occurrence of eight and nine B chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Intraspecific crosses resulting in the first occurrence of eight and nine B chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae)

Host B chromosomes as potential sex ratio distorters of intestinal nematode infrapopulations in the yellow-necked mouse (Apodemus flavicollis)

The Behavior of Accessory Chromosomes in Tetraploid Rye1

Contact Info

Product

Resources

About