The karyotype of the skink, Mabuya blandingi

1984 ◽  
Vol 26 (1) ◽  
pp. 100-103 ◽  
Author(s):  
J. A. Adegoke
Keyword(s):  
Bone Marrow ◽  
Chromosome Number ◽  
Sex Chromosomes ◽  
Diploid Chromosome Number ◽  
Male And Female ◽  
Fundamental Number

The chromosomes of Mabuya blandingi were studied from the bone marrow of male and female animals. The diploid chromosome number in this organism is 32, consisting of 10 large-, 10 medium-, and 12 small-size chromosomes. The fundamental number (NF) is 48. The chromosome complements in both the male and female animals are similar in morphology with no evidence of differentiated sex chromosomes.

scholarly journals One more Microtus species with asynaptic sex chromosomes

2018 ◽  
Vol 70 (3) ◽  
pp. 443-447
Author(s):  
Jelena Blagojevic ◽  
Marija Rajicic ◽  
Vladimir Jovanovic ◽  
Tanja Adnadjevic ◽  
Ivana Budinski ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Diploid Chromosome Number ◽  
First Finding ◽  
Chromosomal Polymorphisms ◽  
Southeastern Serbia

Arvicoline voles are known as a karyotypically extremely polymorphic group in which the genus Microtus leads with the highest rate of karyotype change. A member of this genus, the European pine vole Microtus subterraneus (de Selys-Longchamps, 1836), is widely distributed in Europe and parts of Asia. There are two cytotypes differing in diploid chromosome number, 2n=54 and 52, each showing different chromosomal polymorphisms. At two localities in southeastern Serbia, Mt. Jastrebac and Vlasina, we found the 2n=52 cytotype. Meiotic preparations from males revealed the presence of asynaptic sex chromosomes. Although asynaptic sex chromosomes are frequent in Microtus, this is the first finding for M. subterraneus. From summarized data it appears that two-thirds of the studied species, mainly from Microtus and Terricola subgenera, possess asynaptic sex chromosomes.

B-chromosome Systems in the Greater Glider (Petauroides volans volans) (Marsupialia : Petauridae). I. B-chromosome Distribution

1985 ◽  
Vol 38 (1) ◽  
pp. 189 ◽  
Author(s):  
Leon R McQuade
Keyword(s):  
Bone Marrow ◽  
Chromosome Number ◽  
Y Chromosome ◽  
Stable Equilibrium ◽  
Bone Marrow Cells ◽  
B Chromosome ◽  
B Chromosomes ◽  
Diploid Chromosome Number ◽  
Body Tissues ◽  
Distinct Distribution

Variations in diploid chromosome number, due to the presence of B chromosomes, are found within the distribution of P. v. volans. B chromosomes vary in number between one and eight per animal, are mitotically stable in various body tissues and, unlike the Y chromosome in male P. v. volans, are not eliminated from bone marrow cells. Animals possessing B chromosomes have a distinct distribution, and it appears that a stable equilibrium between the forces of B chromosome accumulation or elimination is operating in those populations possessing these chromosomes.

First Record on Sex Chromosomes in a Species of the Family Cynodontidae: Cynodon gibbus (Agassiz, 1829)

2020 ◽  
Vol 160 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Vanessa S. Pinheiro Figliuolo ◽  
Leonardo Goll ◽  
Patrik Ferreira Viana ◽  
Eliana Feldberg ◽  
Maria C. Gross
Keyword(s):  
Chromosome Number ◽  
Repetitive Dna ◽  
Sex Chromosomes ◽  
First Record ◽  
Diploid Chromosome Number ◽  
Fish Family ◽  
Female Heterogamety ◽  
The Family

The fish family Cynodontidae belongs to the superfamily Curimatoidea, together with the Hemiodontidae, Serrasalmidae, Parodontidae, Prochilodontidae, Chilodontidae, Curimatidae, and Anostomidae. The majority of the species of this superfamily that have been analyzed to date have a diploid chromosome number of 2n = 54. Differentiated sex chromosomes (with female heterogamety) have been observed only in the Prochilodontidae, Parodontidae, and Anostomidae. The present study provides the first description of differentiated sex chromosomes in the cynodontid species Cynodon gibbus, which has a ZZ/ZW system, and shows that repetitive DNA has played a fundamental role in the differentiation of these sex chromosomes.

On sex determination in the Turkish desert woodlouse Hemilepistus elongatus (Crustacea, Isopoda, Oniscidea): searching for sex chromosomes and for sex-specific differences in simple DNA repeats

Genome ◽  
1996 ◽  
Vol 39 (4) ◽  
pp. 818-821 ◽  
Author(s):  
G. Röder ◽  
K. E. Linsenmair ◽  
I. Nanda ◽  
M. Schmid
Keyword(s):  
Chromosome Number ◽  
Sex Determination ◽  
Sex Chromosomes ◽  
Genomic Dna ◽  
Constitutive Heterochromatin ◽  
Dna Repeats ◽  
Male And Female ◽  
General Morphology ◽  
C Banding ◽  
Heteromorphic Sex Chromosomes

The karyotype of male and female Hemilepistus elongatus was investigated by means of C-banding. The diploid chromosome number in both sexes is 2n = 50. By scrutinizing general morphology and localization of the constitutive heterochromatin, no heteromorphic sex chromosomes were found. All chromosome pairs in males are well paired during diakinesis. Hybridization of genomic DNA with (GACA)4 and (GATA)4 oligonucleotides revealed no sex-specific patterns. Key words : karyotype, C-banding, sex determination, simple DNA-repeats, Isopoda.

scholarly journals Karyotypic and Morphometric Analysis of A Predatory Rove Beetle, Paederus littoralis (Coleoptera: Staphylinidae) from Jammu Region of Outer Himalayas, India

2018 ◽  
Vol 15 (2) ◽  
pp. 495-499
Author(s):  
Arshad Ayoub Bhatti ◽  
Manvi Khajuria
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
Morphometric Analysis ◽  
Sex Chromosomes ◽  
Diploid Chromosome Number ◽  
Cereal Aphids ◽  
Rove Beetle ◽  
The Family ◽  
Telocentric Chromosomes ◽  
Chromosomal Data

In the present study, the chromosomes of a predatory rove beetle Paederus littoralis were studied from Jammu region of outer Himalayas. These beetles are also potential bio-control agents in suppressing the populations of cereal aphids. The diploid chromosome number was found to be 2n=32 including 22 metacentric, 3 submetacentric, 6 subtelocentric and 1 telocentric chromosomes. The sex chromosomes (Xyp) included submetacentric X and telocentric y chromosome. Meiotic observations comprised diplotene, diakinesis and metaphase-I. The study is helpful in solving taxonomic problems with in the family Staphylinidae and it authenticates the existence of this particular species through chromosomal data.

Chromosome studies of three families of pelagic heteropod molluscs (Atlantidae, Carinariidae, and Pterotracheidae) from Hawaiian waters

1997 ◽  
Vol 75 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Catherine Thiriot-Quiévreux ◽  
Roger R. Seapy
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Diploid Number ◽  
Diploid Chromosome Number ◽  
Striking Difference ◽  
Evolutionary Trends ◽  
Air Drying ◽  
Submetacentric Chromosome ◽  
Heteromorphic Sex Chromosomes ◽  
Males And Females

Chromosome number and morphology were studied in gonadal tissue of 11 species of Atlantidae, 2 species of Carinariidae, and 3 species of Pterotracheidae, using an air-drying technique and Giemsa staining. In the Atlantidae the diploid chromosome number was the same in males and females and there were no heteromorphic chromosomes. The diploid chromosome number in nine species of Atlanta was 30 and the majority of chromosome pairs were metacentric and submetacentric. In Protatlanta souleyeti the diploid number was 28, and included five metacentric, six submetacentric, and three subtelocentric chromosome pairs. Oxygyrus keraudreni had a diploid chromosome number of 32, with 10 metacentric and 6 submetacentric chromosome pairs. A striking difference between the Atlantidae and the Carinariidae and Pterotracheidae was the presence of heteromorphic sex chromosomes in the latter two families. Male Pterosoma planum (2n = 32) had simple XY sex chromosomes, but males of Carinaria japonica (2n = 33), Pterotrachea scutata (2n = 33), Pterotrachea hippocampus (2n = 31), and Firoloida desmaresti (2n = 31) showed three heteromorphic chromosomes, suggesting a multiple sex-determining mechanism, X1X2Y. The locations of the female sex chromosomes in the karyotypes of female Pterotrachea hippocampus (2n = 32) and Firoloida desmaresti (2n = 32) were tentatively proposed. Cytogenetic features observed among the three families are supportive of previous interpretations of evolutionary trends in the Heteropoda based on morphology, i.e., that the Atlantidae are the most primitive family and gave rise to the Carinariidae and Pterotracheidae.

XX/XY-Sex Chromosomes in Gekko gecko (Sauria, Reptilia)

1984 ◽  
Vol 5 (3-4) ◽  
pp. 339-345 ◽  
Author(s):  
Eva Solleder ◽  
M. Schmid
Keyword(s):  
Bone Marrow ◽  
Chromosome Number ◽  
Sex Chromosomes ◽  
Chromosome Pair ◽  
Banding Patterns ◽  
Gekko Gecko ◽  
Meiotic Chromosomes ◽  
Chromosomal Banding ◽  
Male Sex ◽  
Chromosomal Sex Determination

The mitotic karyotype, chromosomal banding patterns and male meiotic chromosomes of Gekko gecko were studied in differentially stained preparations obtained from bone marrow and testes. A chromosome number of 38 was found with a heteromorphic chromosome pair in the male sex, which indicates a XX/XY-mechanism of chromosomal sex determination. The Y-chromosome was found to be larger than the X-chromosome.

New cytogenetic data on Coreoidea (Hemiptera: Heteroptera) with special reference to Coreidae

Zootaxa ◽  
2012 ◽  
Vol 3313 (1) ◽  
pp. 53 ◽  
Author(s):  
HAILIN YANG ◽  
HU LI ◽  
XUN DAI ◽  
JIAN CHANG ◽  
WANZHI CAI
Keyword(s):  
Chromosome Number ◽  
Special Reference ◽  
Sex Chromosomes ◽  
Meiotic Division ◽  
Phylogenetic Relationships ◽  
Male Meiosis ◽  
Point Of View ◽  
Diploid Chromosome Number ◽  
Holokinetic Chromosomes ◽  
The Family

Some cytogenetic aspects of six Chinese species of Coreoidea were studied. The material included five species from the familyCoreidae: Hydarella orientalis (Distant), Homoeocerus bannaensis Hsiao, Cletus graminis Hsiao & Cheng, Paradasynus lon-girostris Hsiao, Acanthocoris scaber (Linnaeus), and one species from the family Stenocephalidae: Stenocephalus femoralisReuter. All species show holokinetic chromosomes, post-reductional meiotic division of XO sex chromosomes, a pre-reduc-tional type of meiosis for autosomes and m-chromosomes, intersticial chiasmata in most autosomes, and one chiasma per biva-lent in male meiosis. In the species studied, the diploid chromosome number ranged from 13 to 21. It was 13 in S. femoralis (10+ 2m + XO), 15 in Hy. orientalis (12 + 2m + XO), 17 in Ho. bannaensis (14 + 2m + XO) and C. graminis (14 + 2m + XO), 19in P. longirostris (16 + 2m + XO), and 21 in A. scaber (18 + 2m + XO). Hy. orientalis represents the first cytogenetically stud-ied species in subfamily Hydarinae. The phylogenetic relationships among Coreoidea are briefly discussed from a cytogenetic point of view.

The karyotype of amphioxus Branchiostoma belcheri tsingtauense (Cephalochordata)

2003 ◽  
Vol 83 (1) ◽  
pp. 189-191 ◽  
Author(s):  
Changliu Wang ◽  
Shicui Zhang ◽  
Yongzhong Zhang
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Diploid Chromosome Number ◽  
Embryonic Cells ◽  
First Report ◽  
Branchiostoma Belcheri

The chromosome number and karyotype of amphioxus Branchiostoma belcheri tsingtauense were studied using embryonic cells. The diploid chromosome number (2n) of B. belcheri tsingtauense is 36, and its karyotype 2n=36, 2st+34t, FN=36. This is the first report on the karyotype of the cephalochordate. Evidence suggesting the possible presence of a pair of sex-chromosomes in the amphioxus has been provided.

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