THE CHROMOSOMAL COMPLEMENT OF THE YELLOW-CHEEKED VOLE: Microtus xanthognathus (Leach)

1974 ◽  
Vol 16 (2) ◽  
pp. 267-272 ◽  
Author(s):  
V. R. Rausch ◽  
R. L. Rausch
Keyword(s):  
Y Chromosome ◽  
X Chromosome ◽  
Medium Size ◽  
Fundamental Number ◽  
Chromosomal Number ◽  
Chromosomal Complement ◽  
History Of ◽  
Haploid Complement

The karyotype of Microtus xanthognathus (Leach) is described, based on material from one female and one male vole. The diploid chromosomal number was found to be 54, and the fundamental number 62. The metacentric X-chromosome was of medium size and averaged 6.6% of the haploid complement. The designated Y-chromosome was near acrocentric. The specific distinction of M. xanthognathus and Microtus chrotorrhinus (Miller) was confirmed by the recognition of major differences in karyotype and differences in fundamental number. The distributional history of M. xanthognathus is briefly discussed.

scholarly journals A Cytogenetic Study on Spermophilus Xanthoprymnus (Bennett, 1835) in Isparta Province

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Şengül AKSAN ◽  
Kuyaş HEKİMLER ÖZTÜRK ◽  
Teoman KANKILIÇ
Keyword(s):  
Y Chromosome ◽  
Geographical Distribution ◽  
X Chromosome ◽  
Ground Squirrel ◽  
Cytogenetic Study ◽  
Medium Size ◽  
Chromosomal Structure ◽  
Fundamental Number ◽  
Standard Procedures ◽  
Spermophilus Xanthoprymnus

This study was conducted to explain the karyological characteristics of S. xanthoprymnus from Gencali in Turkey. The chromosomes of the specimens were traditionally stained and examined according to standard procedures. The chromosomes were determined according to centromere positions by examining the photographs of metaphase cells. The karyotype of S. xanthoprymnus contained 42 chromosomes (2n=42) and fundamental number of chromosomal arms NF=81 and the number of autosomal arms NFa=78. The karyotype includes four metacentric chromosomes ranging from large to small, three pairs of large and medium-sized submetacentric autosome, twelve ranging from large to medium size subtelocentric, and a pair of acrocentric autosomes. The X chromosome was determined as large subtelocentric and Y chromosome as small acrocentric. Due to there is no karyological information and geographical distribution of existentence cytotypes in Turkey, revelation of chromosomal structure in Anatolian ground squirrel populations will provide properly assessment of taxonomy of those rodents in further studies.

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.

scholarly journals A rare chromosomal polymorphism in a Kangayam bull (Bos indicus) of south India

2021 ◽  
Vol 15 (4) ◽  
pp. 459-465
Author(s):  
Vemula Harshini ◽  
P. Kumarasamy ◽  
S.M.K. Karthickeyan
Keyword(s):  
Y Chromosome ◽  
X Chromosome ◽  
South India ◽  
Bos Indicus ◽  
Chromosomal Polymorphism ◽  
Chromosomal Complement ◽  
Semen Collection ◽  
Frozen Semen

A chromosomal polymorphism was detected on karyological screening of Kangayam breeding sires prior to subjecting them for frozen semen collection. One bull possessed the chromosomal complement 2n = 60, consisting of 58 acrocentric autosomes, one large sub-metacentric X-chromosome, and one small acrocentric Y-chromosome with a small visible p-arm, which was further confirmed using CBG- and GTG-banding. This polymorphism was attributed to a heterochromatin variation of the acrocentric Y-chromosome routine in the Bos indicus Linnaeus, 1758 cattle.

Evolution of a Y Chromosome from an X Chromosome

2019 ◽  
Author(s):  
Roberta Bergero ◽  
Jim Gardner ◽  
Deborah Charlesworth
Keyword(s):  
Y Chromosome ◽  
X Chromosome

scholarly journals Recombination between the mouse Y chromosome short arm and an additional Y short arm-derived chromosomal segment attached distal to the X chromosome PAR

Chromosoma ◽  
2015 ◽  
Vol 125 (2) ◽  
pp. 177-188
Author(s):  
Fanny Decarpentrie ◽  
Obah A. Ojarikre ◽  
Michael J. Mitchell ◽  
Paul S. Burgoyne
Keyword(s):  
Y Chromosome ◽  
X Chromosome ◽  
Chromosomal Segment

Roles of Anti-Müllerian hormone (Amh) and its duplicates in sex determination and germ cell proliferation of Nile tilapia

Genetics ◽  
2021 ◽  
Author(s):  
Xingyong Liu ◽  
Shengfei Dai ◽  
Jiahong Wu ◽  
Xueyan Wei ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Cell Proliferation ◽  
Sex Determination ◽  
Germ Cell ◽  
Y Chromosome ◽  
X Chromosome ◽  
Nile Tilapia ◽  
Critical Period ◽  
Sex Reversal ◽  
Homozygous Mutation ◽  
Germ Cell Proliferation

Abstract Duplicates of amh are crucial for fish sex determination and differentiation. In Nile tilapia, unlike in other teleosts, amh is located on X chromosome. The Y chromosome amh (amh△-y) is mutated with 5 bp insertion and 233 bp deletion in the coding sequence, and tandem duplicate of amh on Y chromosome (amhy) has been identified as the sex determiner. However, the expression of amh, amh△-y and amhy, their roles in germ cell proliferation and the molecular mechanism of how amhy determines sex is still unclear. In this study, expression and functions of each duplicate were analyzed. Sex reversal occurred only when amhy was mutated as revealed by single, double and triple mutation of the three duplicates in XY fish. Homozygous mutation of amhy in YY fish also resulted in sex reversal. Earlier and higher expression of amhy/Amhy was observed in XY gonads compared with amh/Amh during sex determination. Amhy could inhibit the transcription of cyp19a1a through Amhr2/Smads signaling. Loss of cyp19a1a rescued the sex reversal phenotype in XY fish with amhy mutation. Interestingly, mutation of both amh and amhy in XY fish or homozygous mutation of amhy in YY fish resulted in infertile females with significantly increased germ cell proliferation. Taken together, these results indicated that up-regulation of amhy during the critical period of sex determination makes it the sex-determining gene, and it functions through repressing cyp19a1a expression via Amhr2/Smads signaling pathway. Amh retained its function in controlling germ cell proliferation as reported in other teleosts, while amh△-y was nonfunctionalized.

scholarly journals The role of matrilineality in shaping patterns of Y chromosome and mtDNA sequence variation in southwestern Angola

2018 ◽  
Author(s):  
Sandra Oliveira ◽  
Alexander Hübner ◽  
Anne-Maria Fehn ◽  
Teresa Aço ◽  
Fernanda Lages ◽  
...  
Keyword(s):  
Y Chromosome ◽  
Sequence Data ◽  
Population History ◽  
Female Population ◽  
Bantu Languages ◽  
Mtdna Sequence ◽  
Population Sizes ◽  
Group Variation ◽  
History Of ◽  
Previous Demonstration

AbstractSouthwestern Angola is a region characterized by contact between indigenous foragers and incoming food-producers, involving genetic and cultural exchanges between peoples speaking Kx’a, Khoe-Kwadi and Bantu languages. Although present-day Bantu-speakers share a patrilocal residence pattern and matrilineal principle of clan and group membership, a highly stratified social setting divides dominant pastoralists from marginalized groups that subsist on alternative strategies and have previously been though to have pre-Bantu origins. Here, we compare new high-resolution sequence data from 2.3 Mb of the non-recombining Y chromosome (NRY) from 170 individuals with previously reported mitochondrial genomes (mtDNA), to investigate the population history of seven representative southwestern Angolan groups (Himba, Kuvale, Kwisi, Kwepe, Twa, Tjimba, !Xun) and to study the causes and consequences of sex-biased processes in their genetic variation. We found no clear link between the formerly Kwadi-speaking Kwepe and pre-Bantu eastern African migrants, and no pre-Bantu NRY lineages among Bantu-speaking groups, except for small amounts of “Khoisan” introgression. We therefore propose that irrespective of their subsistence strategies, all Bantu-speaking groups of the area share a male Bantu origin. Additionally, we show that in Bantu-speaking groups, the levels of among-group and between-group variation are higher for mtDNA than for NRY. These results, together with our previous demonstration that the matriclanic systems of southwestern Angolan Bantu groups are genealogically consistent, suggest that matrilineality strongly enhances both female population sizes and interpopulation mtDNA variation.

scholarly journals History of Click-Speaking Populations of Africa Inferred from mtDNA and Y Chromosome Genetic Variation

2007 ◽  
Vol 24 (10) ◽  
pp. 2180-2195 ◽  
Author(s):  
S. A. Tishkoff ◽  
M. K. Gonder ◽  
B. M. Henn ◽  
H. Mortensen ◽  
A. Knight ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Y Chromosome ◽  
History Of

CERAMIC HISTORY, CERAMIC CHANGE, AND ARCHITECTURAL SEQUENCE AT ACANMUL, CAMPECHE: A LOCAL CHRONICLE AND ITS REGIONAL IMPLICATIONS

2015 ◽  
Vol 26 (2) ◽  
pp. 233-273 ◽  
Author(s):  
Joseph W. Ball ◽  
Jennifer T. Taschek
Keyword(s):  
Architectural History ◽  
Ninth Century ◽  
Medium Size ◽  
State University ◽  
Central Coast ◽  
The North ◽  
New Information ◽  
History Of ◽  
San Diego State University ◽  
The City

AbstractAcanmul is a medium-size center located at the north end of the Bay of Campeche about 25 km northeast of the city of Campeche. Between 1999 and 2005, three independent sets of investigations and major architectural consolidation were carried out at the center by archaeologists from the Universidad Autónoma de Campeche (UAC), the Instituto Nacional de Antropología e Historia (INAH), Centro Regional de Campeche, and UAC in collaboration with San Diego State University. These efforts produced a wealth of new information on the archaeology of the central Campeche coast, including new insights into the emergence and evolution of the northern slateware tradition and the architectural history of the central coast from Preclassic through Postclassic times. New data concerning changing relationships through time of the central coast Maya to both the interior central and southern lowlands and to the northern plains also were documented, as was the mid ninth century sacking of the center. This article synthesizes the findings of the three separate institutional efforts at Acanmul and offers a number of new cultural historical scenarios and hypotheses based on them.

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