The Chromosomes of 4 Genera of Possums From the Family Petauridae (Marsupialia, Diprotodonta)

1990 ◽  
Vol 38 (1) ◽  
pp. 33 ◽  
Author(s):  
JD Murray ◽  
SC Donnellan ◽  
GM Mckay ◽  
RH Rofe ◽  
PR Baverstock ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Sex Chromosomes ◽  
Chromosome Numbers ◽  
Chromosomal Rearrangement ◽  
Diploid Chromosome Number ◽  
The Family ◽  
Relationship Of ◽  
The Relationship ◽  
Petaurus Australis

The standard and C-banded (four species) karyotypes of six species of the family Petauridae (Gymnobelideus leadbeateri, Petaurus australis, P. breviceps, P. norfolcensis, Dactylopsila trivirgata and Dactylonax palpator) are described. The G-banded karyotype of P. norfolcensis is also described. Gymnobelideus and Petaurus have diploid chromosome number of 22. All three species of Petaurus have a similar karyotype, consisting of biarmed autosomes and very small sex chromosomes, which differs from Gymnobelideus by a minimum of one chromosomal rearrangement of each autosome. Dactylopsila and Dactylonax have similar karyotypes with diploid chromosome numbers of 18. The relationship of these two genera to Petaurus is still uncertain but all members of this family differ from Pseudocheiridae in the small size of the sex 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.

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 Chromosomal analysis of Astyanax fasciatus (PISCES, CHARACIDAE) from the Araguari river, Uberlândia, MG, Brazil

2006 ◽  
Vol 66 (1a) ◽  
pp. 161-165 ◽  
Author(s):  
A. R. Torres-Mariano ◽  
S. Morelli
Keyword(s):  
Chromosome Number ◽  
Silver Nitrate ◽  
Chromosome Numbers ◽  
Chromosomal Analysis ◽  
Diploid Chromosome Number ◽  
Nucleolar Organizing Regions ◽  
Astyanax Fasciatus ◽  
The Family ◽  
Silver Nitrate Staining ◽  
Parana Basin

The genus Astyanax is one of the most numerous of the family Characidae, comprising a large number of similar-shaped species, but displaying innumerable karyotypic variations in its chromosome number and/or structure. The literature describes A. fasciatus populations with diploid chromosome numbers varying from 2n = 45 to 2n = 48. In this study, A. fasciatus specimens captured in the Araguari River (Alto Paraná basin) were cytogenetically characterized, revealing a diploid chromosome number of 2n = 46. The nucleolar organizing regions (NORs), detected with silver nitrate staining, showed a multiple system with two pairs of marked chromosomes. These findings are congruent with those of other studies involving populations of the same species.

scholarly journals Malpighiaceae: correlations between habit, fruit type and basic chromosome number

2003 ◽  
Vol 17 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Ricardo A. Lombello ◽  
Eliana R. Forni-Martins
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Basic Number ◽  
Basic Chromosome Number ◽  
Basic Chromosome ◽  
Monophyletic Origin ◽  
The Family ◽  
Number Variation ◽  
Family Based ◽  
The Relationship

The family Malpighiaceae presents species with different habits, fruit types and cytological characters. Climbers are considered the most derived habit, followed, respectively, by the shrubby and arboreal ones. The present study examines the relationship between basic chromosome numbers and the derivation of climbing habit and fruit types in Malpighiaceae. A comparison of all the chromosome number reports for Malpighiaceae showed a predominance of chromosome numbers based on x=5 or 10 in the genera of sub-family Malpighioideae, mainly represented by climbers with winged fruits, whereas non-climbing species with non-winged fruits, which predominate in sub-family Byrsonimoideae, had counts based on x=6, which is considered the less derived basic number for the family. Based on such data, confirmed by statistic assays, and on the monophyletic origin of this family, we admit the hypothesis that morphological derivation of habit and fruit is correlated with chromosome basic number variation in the family Malpighiaceae.

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.

CHILD-PARENT RELATIONS AS A FACTOR IN THE FORMATION OF PROFESSIONAL PREFERENCES IN PEDAGOGICAL DYNASTIES

2020 ◽  
Vol 2 (4) ◽  
pp. 126-130
Author(s):  
N. V. SHAMANIN ◽  
Keyword(s):  
Professional Development ◽  
The Family ◽  
The Individual ◽  
Relationship Of ◽  
The Relationship ◽  
Parent Child Relationships ◽  
Professional Preferences ◽  
Parent Child

The article raises the issue of the relationship of parent-child relationships and professional preferences in pedagogical dynasties. Particular attention is paid to the role of the family in the professional development of the individual. It has been suggested that there is a relationship between parent-child relationships and professional preferences.

The Relationship of Learning Entrepreneurship, Enterprise Motivation, And the Family Environment with Enterprise Interest in Students

2020 ◽  
Vol 4 (4) ◽  
pp. 314
Author(s):  
Ida Rochanawati ◽  
Agusti Efi
Keyword(s):  
Family Environment ◽  
Sampling Technique ◽  
Simple Correlation ◽  
Study Program ◽  
The Family ◽  
Data Collection Instrument ◽  
Research Population ◽  
Entrepreneurial Knowledge ◽  
Relationship Of ◽  
The Relationship

Many of Bunda's Tourism Diploma graduates are still unemployed because some are less interested in becoming self-employed. It because students are not motivated to become entrepreneurs, and the family environment is not yet supported. This study aimed to measure: the relationship between entrepreneurial learning outcomes, entrepreneurial motivation, and family environment with interest in entrepreneurship. This type of research is descriptive correlational. This research population is all students of the Hospitality study program of the Bunda Padang Tourism Academy, batch 2017 and 2018, totaling 61 students. The sample in this study were 61 students using the total sampling technique. The data collection instrument used a questionnaire using a Likert scale and data analysis methods, including simple correlation and multiple correlations. Research is expected to increase students' entrepreneurial knowledge through attitudes, knowledge, and skills to overcome entrepreneurial tasks' complexity, providing real experiences for students to carry out entrepreneurial practices.

A GENETIC AND METABOLIC STUDY OF A FAMILY WITH HYPERLIPEMIA

PEDIATRICS ◽  
1962 ◽  
Vol 29 (4) ◽  
pp. 566-578
Author(s):  
George Bialkin ◽  
Saul Zucker ◽  
Burton S. Sklarin ◽  
Kurt Hirschhorn ◽  
Murray Davidson
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Lipid Levels ◽  
Metabolic Study ◽  
Diagnosis And Prognosis ◽  
The Family ◽  
Artery Disease ◽  
Pathologic Physiology ◽  
Relationship Of ◽  
The Relationship

A family consisting of a mother and father, heterozygous for idiopathic hyperlipemia, and their four offspring, one heterozygous and three homozygous for the disease, are described. In addition, a fifth child who is heterozygous, born of same mother but by another incompletely studied father, is presented. The genetics of the disease in this family, and also in the general population, with emphasis on diagnosis and prognosis in heterozygotes is discussed. The interrelationship of various lipid components in serum and their metabolism are briefly reviewed. The possible defective mechanisms in hyperlipemia, the techniques for deciding on the specific defect, and their application to the members of this family are reviewed. The effect of heparin, nicotinic acid, and fat-free diets in the homozygous members of the family are evaluated and their therapeutic applications are discussed. The symptomatology, possible pathologic physiology, relationship to lipid levels in serum and occurrence of abdominal crises in some of the homozygous members of this family are pointed out. The relationship of cholesterol and triglyceride levels in serum to, and the significance of, idiopathic hyperlipemia in the genesis of, atherosclerosis and coronary artery disease is elucidated.

ON THE RELATIONSHIP OF THE FISHES OF THE FAMILY SIGANIDÆ

1907 ◽  
Vol 13 (4) ◽  
pp. 211-218 ◽  
Author(s):  
EDWIN CHAPIN STARKS
Keyword(s):  
The Family ◽  
Relationship Of ◽  
The Relationship

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.

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