scholarly journals First Report on Karyotypic, Morphometric and Meiotic Analysis of a Predatory Bombardier Beetle Pherosophus catoirai (Coleoptera: Carabidae) from Jammu region of Outer Himalayas, India

2021 ◽  
Vol 18 (4) ◽  
pp. 817-822
Author(s):  
Arshad Ayoub Bhatti ◽  
Nidhi Slathia ◽  
Manvi K
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
X Chromosome ◽  
Chromosome Complement ◽  
Diploid Chromosome Number ◽  
Meiotic Analysis ◽  
Chromosome Y ◽  
First Report ◽  
Metaphase Stage ◽  
Spermatogonial Metaphase

Chromosomal studies and manual karyotyping are the aged techniques for determining the identity of a species on evolutionary scale; however, these techniques are simple, reliable and inexpensive to authenticate the existence of a particular species. In the present work, the chromosome complement and meiotic processes of a predatory bombardier beetle Pherosophus catoirai were investigated. This species presented 2n=35 as diploid chromosome number and the chromosomal formula was found to be 12m+8sm+12st+X0. Sex mechanism was X0 type with metacentric X chromosome. Y chromosome was absent in this species. Karyotype revealed small chromosomes except X chromosome which is found to be largest in the spermatogonial metaphase stage. Meiotic stages were pachytene, diplotene, diakinesis and metaphase-I. Present study may find importance to analyse evolution of chromosomes in order Coleoptera particularly in family Carabidae.

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.

scholarly journals Karyotype analysis with orcein and CMA in two species of Alocasia (Schott) G. Don (Araceae)

1970 ◽  
Vol 40 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Syeda Sharmeen Sultana ◽  
Hosne Ara ◽  
Sheikh Shamimul Alam
Keyword(s):  
Chromosome Number ◽  
Key Words ◽  
Karyotype Analysis ◽  
Chromosome Complement ◽  
Taxonomic Status ◽  
The Other ◽  
First Report ◽  
Total Length ◽  
Internet Information ◽  
Chromosomal Length

Alocasia fallax Schott and A. odora (Roxb.) Koch (Araceae) were investigated cytogenetically to confirm their taxonomic status. There is no report of 2n chromosome number for A. fallax in the available literature and internet information. Therefore the 2n chromosome number (2n = 28) found in this study is probably the first report for A. fallax. Alocasia odora showed exactly double 2n chromosome number (2n = 56) from A. fallax. In addition to chromosome number, the other karyotypic features of A. odora were exactly double for that of A. fallax. The centromeric formulae of A. fallax was 24 m + 4 sm whereas it is just double in A. odora. Total length of 2n chromosome complement of A. odora (62.58 μm) was almost double to A. fallax. The range of chromosomal length of the two species was almost same. Moreover, A. odora plant is much taller than A. fallax. All of these data suggests that A. odora might be an autotetraploid of A. fallax which in course of evolution had undergone some changes in GC-rich repeats. Key words: Alocasia; CMA; Karyotype analysis DOI: http://dx.doi.org/10.3329/bjb.v40i1.7998 Bangladesh J. Bot. 40(1): 53-56, 2011 (June)

scholarly journals Profiling of Chromosomal Complement in Nandidurga Goats of Karnataka

2021 ◽  
Author(s):  
Basavraj Inamdar ◽  
R. Nagaraja ◽  
H.M. Yathish ◽  
S. Naveen Kumar ◽  
G.S. Naveen Kumar ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
X Chromosome ◽  
Relative Length ◽  
Lymphocyte Culture ◽  
Short Term ◽  
Blood Samples ◽  
Chromosomal Complement ◽  
Morphological Index ◽  
The Mean

Background: To characterize the chromosomal complement of Nandidurga goats. Methods: Blood samples for short term lymphocyte culture were collected from 5 bucks and 5 does from its breeding tract and then mitotic chromosomal spreads were accomplished. Result: The diploid chromosome number was found to be 60, consisting of 58 acrocentric autosomes and 2 sex chromosomes (X and Y). The X chromosome was found to be the longest acrocentric and Y chromosome was found to be sub metacentric. The mean mitotic drive was 64.5±2.01 and 63.15±1.30 percent in bucks and does, respectively. The mean relative length of autosomes varied from 2.08±0.24 to 4.81±0.12 in does and 2.09±0.09 to 4.70±0.11in bucks. The relative length of X chromosome in does was 5.14±0.17 and that in bucks was 4.92±0.21, whereas Y chromosome had a relative length of 1.99±0.20. The mean Arms Ratio, Centromeric Index and Morphological Index were 2.47, 31.62 and 396.14, respectively. This cytogenetic analysis indicates the normal chromosomal complement in the studied Nandidurga goats.

The Karyotype of Blainville’s Beaked Whale, Mesoplodon densirostris

2020 ◽  
pp. 1-6
Author(s):  
Ross Brookwell ◽  
Kimberly Finlayson ◽  
Jason P. van de Merwe
Keyword(s):  
Chromosome Number ◽  
Y Chromosome ◽  
X Chromosome ◽  
Organizer Region ◽  
Nucleolar Organizer Region ◽  
Nucleolar Organizer ◽  
Large Block ◽  
Beaked Whale

The karyotype of the Odontocete whale, <i>Mesoplodon densirostris</i>, has not been previously reported. The chromosome number is determined to be 2n = 42, and the karyotype is presented using G-, C-, and nucleolar organizer region (NOR) banding. The findings include NOR regions on 2 chromosomes, regions of heterochromatic variation, a large block of heterochromatin on the X chromosome, and a relatively large Y chromosome. The karyotype is compared to published karyograms of 2 other species of <i>Mesoplodon</i>.

BANDING ANALYSIS OF THE CHROMOSOMES OF MARMOSA MITIS (MURINE OPOSSUM)

1974 ◽  
Vol 16 (1) ◽  
pp. 31-38 ◽  
Author(s):  
Frances M. Curcuru-Giordano ◽  
Richard G. Weed ◽  
Edmund C. Jenkins
Keyword(s):  
Bone Marrow ◽  
Chromosome Number ◽  
Y Chromosome ◽  
Cell Cultures ◽  
X Chromosome ◽  
Chromosome Elimination ◽  
Modal Chromosome Number ◽  
Banding Analysis ◽  
Lung Cell Cultures

The modal chromosome number of 14 has been confirmed in Marmosa mitis by examining 622 metaphase spreads derived from heart and lung cell cultures as well as from direct bone marrow preparations. Nine adult individuals, seven females and two males, were investigated. Preferential Y chromosome elimination was observed in both males. It was found that four of the seven chromosome pairs could be identified morphologically while Q-banding allowed differentiation of all chromosomes. The ASG technique revealed that one X chromosome was consistently heterochromatic.

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.

scholarly journals Rates of Sex Chromosome Loss during Development in Different Tissues of the Bandicoots Perameles nasuta and Isoodon macrourus (Marsupialia: Peramelidae)

1984 ◽  
Vol 37 (2) ◽  
pp. 53 ◽  
Author(s):  
RL Close
Keyword(s):  
Y Chromosome ◽  
X Chromosome ◽  
Sex Chromosome ◽  
Chromosome Complement ◽  
Chromosome Loss ◽  
Somatic Tissues ◽  
Different Tissues

An X chromosome disappears from female cells and the Y chromosome from male cells of some somatic tissues of all peramelid bandicoots, leaving cells with a 2n = 13 (i.e. XO) chromosome complement. The patterns of loss, which differ among tissues and species, were studied during development of specimens of P. nasuta and /. macrourus.

Heterochromatin organization in the nucleus of Indian muntjac (Muntiacus muntjak)

1986 ◽  
Vol 28 (4) ◽  
pp. 628-630 ◽  
Author(s):  
Ram S. Verma ◽  
Jessey P. Jacob ◽  
Arvind Babu
Keyword(s):  
Restriction Endonuclease ◽  
Y Chromosome ◽  
X Chromosome ◽  
General Pattern ◽  
Banding Technique ◽  
Chromosome Y ◽  
Heterochromatic Segment ◽  
Indian Muntjac ◽  
Muntiacus Muntjak

The heterochromatin in Indian muntjac (Muntiacus muntjak) is located at the periphery of primary constrictions of all the chromosomes. The X chromosome contains significantly larger amounts of heterochromatin than the rest of the complement by C-banding technique. However, the small portion of C-band region was found to be resistant by restriction endonuclease HaeIII (5′… GG ↓ CC … 3′) and was clearly visible on the nucleus. Therefore, the position of this large heterochromatic segment is examined at somatic metaphases. The distribution of the heterochromatin of the X chromosome observed in Indian muntjac is contrary to the general pattern observed in other species, i.e., the chromosomes consisting greater amount of heterochromatin are located more peripherally than those with lesser amount. However, the smaller Y chromosome (Y1) is frequently found at the periphery. The present findings suggest that the role of heterochromatin organization in the nucleus vary between different heterochromatic segments of the same species and vary from species to species.Key words: heterochromatin, chromosome, nucleus, metaphase, Muntiacus muntjak.

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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