Meiotic chromosome number and behavior ofMatthiola shehbaziisp. nov. (Brassicaceae,Anchonieae) from central Iran

A basic chromosome number of x = 9 has been confirmed for Cenchrus ciliaris L. Polyploidy is common and levels vary from tetraploid to hexaploid. Aneuploidv is reported for a single specimen, where two chromosomes of a single genome were lost. Various meiotic irregularities were observed. The highest incidence of meiotic abnormalities was observed in the pentaploid specimens. This was attributed to their uneven polyploid level All specimens varied from segmental alloploid to alloploid.

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Chromosome Number and Behavior in Arctic Mosses

Botanical Gazette ◽

10.1086/335851 ◽

1954 ◽

Vol 116 (2) ◽

pp. 93-133 ◽

Cited By ~ 22

Author(s):

William C. Steere

Keyword(s):

Chromosome Number ◽

And Behavior

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Cytogenetic studies in relation to taxonomy within the family Gryllidae (Orthoptera). I. Subfamily Gryllinae

Canadian Journal of Zoology ◽

10.1139/z73-026 ◽

1973 ◽

Vol 51 (2) ◽

pp. 179-186 ◽

Cited By ~ 15

Author(s):

H.-C. Lim ◽

V. R. Vickery ◽

D. K. McE. Kevan

Keyword(s):

Chromosome Number ◽

Species Level ◽

B Chromosomes ◽

Chromosome Behavior ◽

Generic Level ◽

The Family ◽

Cytogenetic Studies ◽

Gryllus Campestris ◽

And Behavior

Twelve species of Gryllinae were studied to determine the number, morphology and behavior of their chromosomes. The male diploid numbers ranged from 19 to 31. Gryllus campestris and a population of "G. bimaculatus" from Singapore showed anomalies in chromosome behavior and structure, including breaks, stickiness, C-mitosis, polyploidy, lagging, unequal segregation and non-disjunction in the former and many aberrations and loss of fertility in the latter. One or two B-chromosomes occurred in some individuals of G. veletis, the chromosome number of this species thus varying from 2n ♀ = 29 to 31. In the Gryllinae, karyotypic differences are shown to be more useful than chromosome number at the species level; differences in chromosome number are useful taxonomically at the generic level, when combined with differences in karyotypes.

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Altered Cohesin Gene Dosage Affects Mammalian Meiotic Chromosome Structure and Behavior

PLoS Genetics ◽

10.1371/journal.pgen.1003241 ◽

2013 ◽

Vol 9 (2) ◽

pp. e1003241 ◽

Cited By ~ 32

Author(s):

Brenda Murdoch ◽

Nichole Owen ◽

Michelle Stevense ◽

Helen Smith ◽

So Nagaoka ◽

...

Keyword(s):

Chromosome Structure ◽

Gene Dosage ◽

Meiotic Chromosome ◽

And Behavior

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The chromosomes of Metachirus nudicaudatus (Marsupialia : Didelphidae)

Australian Journal of Zoology ◽

10.1071/zo9730369 ◽

1973 ◽

Vol 21 (3) ◽

pp. 369 ◽

Cited By ~ 1

Author(s):

E Yunis ◽

J Cayon ◽

E Ramirez

Keyword(s):

Chromosome Number ◽

Y Chromosome ◽

Sex Chromosomes ◽

Evolutionary History ◽

Meiotic Chromosome ◽

Staining Technique ◽

Pachytene Stage ◽

Apparent Lack ◽

Heterochromatin Staining ◽

Metachirus Nudicaudatus

A karyologic study of M. nudicaudatus, carried out on three females and five males, shows a chromosome number of 14, with apparent lack of dimorphism in the sex chromosomes. Nevertheless, the heterochromatin staining technique reveals the Y chromosome to be fully heteropycnotic. The meiotic chromosome has a sex vesicle at the pachytene stage. The similarity of this karyotype with those of Caluromys derbianus and Dromiciops australis is striking, especially considering that the genera belong to two subfamilies separated early in their evolutionary history. Our results support the opinion of Hayman and Martin that the original chromosome number in Marsupialia was 14.

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Additional documented chromosome number determinations in Paysonia (Brassicaceae)

Journal of the Botanical Research Institute of Texas ◽

10.17348/jbrit.v15.i2.1163 ◽

2021 ◽

Vol 15 (2) ◽

pp. 575-577

Author(s):

Andrew M. Salywon ◽

Jon P. Rebman ◽

David A. Dierig

Keyword(s):

Chromosome Number ◽

Meiotic Chromosome

Thirteen meiotic chromosome number determinations are reported for seven species of Paysonia O’Kane & Al-Shehbaz (Brassicaceae). Our counts are in agreement with previous published numbers and we make new chromosome number reports for five counties.

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Meiotic chromosome number in a few taxa of the Lamiaceae from Lahaul-Spiti (Cold desert) and its adjoining areas of North West Indian Himalaya

Chromosome Botany ◽

10.3199/iscb.10.128 ◽

2015 ◽

Vol 10 (4) ◽

pp. 128-137

Author(s):

Devendra Kumar Srivastava ◽

Manjit Inder Singh Saggoo ◽

Vivek Sharma

Keyword(s):

Chromosome Number ◽

Meiotic Chromosome ◽

West Indian ◽

Cold Desert ◽

Indian Himalaya ◽

North West

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Cytotaxonomic studies on some cyclopoid copepods (Copepoda, Crustacea) from Ontario, Canada

Canadian Journal of Zoology ◽

10.1139/z79-209 ◽

1979 ◽

Vol 57 (8) ◽

pp. 1597-1604 ◽

Cited By ~ 7

Author(s):

C. C. Chinnappa ◽

Reginald Victor

Keyword(s):

Chromosome Number ◽

Meiotic Chromosome ◽

Mesocyclops Leuckarti ◽

Mesocyclops Edax

The cytology of 10 Ontario species of cyclopoid copepods has been investigated. The chromosome number and meiotic chromosome behaviours are described for the females of Acanthocyclops vernalis (2n = 8), Acanthocyclops vernalis ssp. Parcus? (2n = 6), Tropocyclops prasinus mexicanus (2n = 11), Eucyclops setrulatus (2n = 13), Eucyclops speratus (2n = 13), Mesocyclops leuckarti (2n = 12), Mesocyclops edax (2n = 14), Macrocyclops albidus (2n = 14), Macrocyclops ater (2n = 22), and Diacyclops bicuspidatus thomasi (2n = 18). Cytotaxonomic implications in relation to the evolution in this group are discussed.

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