I. LIGUTIĆ
MALFORMATION SYNDROME AND GENETIC COUNSELLING [Abstract]
V. DRINČIĆ
PROBLEMS DE LA PRATIQUE OPHTALMO-GENETIQUE [Abstract]
P. ŽEŠKOV i Ljiljana ZERGOLLERN
A RARE KARYOTYPE FOUND IN KLINEFELTER SYNDROME [Abstract]
Marija GUĆ-ČUBRILO and B. GARŽIČIĆ
DISTRIBUTION (RANDOM OR NON RANDOM) OF A LATE REPLICATING X CHROMOSOME IN A MAMMALIAN FEMALE COMPLEMENT UNDER IN VIVO CONDITIONS [Abstract]
Angelina PETROVIĆ, B. GARZIČIĆ and Milena ĆIRIĆ
THE ACTION OF CYTOSINE-ARABINOSIDE ON THE CHROMOSOMES OF HUMAN LYMPHOCYTES FROM PERIPHERAL BLOOD CULTURE IN VITRO [Abstract]
A. KAŠTELAN, V. KERHIN-BRKLJAČIĆ, Lj. BRKLJAČIĆ. P. MAČAŠOVIĆ, Ž. KOVAČ and LJ. ČEČUK
THE DISTRIBUTION OF TRANSPLANTATION ANTIGENS AND GENES IN YUGOSLAV POPULATION. POPULATION STUDIES [Abstract]
A. KAŠTELAN, LJ. BRKLJAČIĆ, V. KERHIN-BRKLJAČIĆ, P. MAČAŠOVIĆ, Ž. KOVAČ, LJ. ČEČUK and J. LIGUTIĆ
DISTRIBUTION OF TRANSPLANTATION ANTIGENS AND GENES IN THE YUGOSLAV POPULATION. FAMILY STUDIES [Abstract]
M. MILUTINOVIĆ
DIE ZYTOLOGISCHE IDENTIFIZIERUNG VON INDUZIERTEN PISUM TRANSLOKATIONEN [Abstract]
J. DUMANOVIĆ, M. DENIĆ and Kosana KONSTANTINOV
VARIATION IN KERNEL PHENOTYPE AND SOME BIOCHEMICAL PROPERTIES IN OPAQUE 2 FROM DIFFERENT GENETIC BACKGROUNDS [Abstract]
H.P. MULLER and S.R. BACQUAR
THE GENETIC VARIATION IN SEED PROTEIN CONTENT AND SOME OTHER BREEDING CHARACTERS IN PISUM MUTANTS AND RECOMBINANTS [Abstract]
V.P. GUPTA, S. RAMANUJAM and A.K. KAUL
GENETIC ANALYSIS IN RESPECT TO PROTEIN CONTENT AND PROTEIN QUALITY IN CHICKPEA (CICER ARIETINUM L.) [Abstract]
V.P. GUPTA, S. RAMANUJAM and A.K. KAUL
STABILITY ANALYSIS IN RESPECT OF PROTEIN, SULPHUR AND PROTEIN VALUE INDEX OF SEED AND ITS IMPLICATION IN ADAPTATION OF CHICKPEA (CICER ARIETINUM L.) [Abstract]
V.P. GUPTA and S. RAMANUJAM
CUMULATIVE GENE EFFECTS AND GENETIC PARAMETERS OF HETEROSIS IN F1 AND F2 GENERATIONS OF CHICKPEAS (CICER ARIETINUM L.). [Abstract]
V. LESKOVAC, S. TRIVIĆ, R. INJAC and D. STEPANOV-JERANCE
ABSENCE OF SIGNIFICANT DIFFERENCES IN OVERALL NUCLEOTIDE COMPOSITION OF RIBONUCLEIC ACIDS FROM SEVERAL ZEA MAYS VARIETIES [Abstract]
S. ŽIVKOVIĆ and B. PETROV
RECORD OF A VOLE OF THE MICROTUS ARVALIS GROUP WITH 54 CHROMOSOMES (MICROTUS SUB ARVALIS MEYER, ORLOV ET SKHOLL, 1972) IN YUGOSLAVIA AND COMPARISON OF ITS KARYOTYPE WITH THAT OF PITYMYS FELTENI MALEC ET STORCH, 1963 (RODENTIA, MAMMALIA) [Abstract]
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 137-145
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
MALFORMATION SYNDROME AND GENETIC COUNSELLING
I. LIGUTIĆ
Institut za zaštitu majki i djece, 41000 Zagreb, Jugoslavija
Abstract
Ligutić, I. (1974): Malformation syndrome and genetic counselling. - Genetika, Vol. 6, No. 2, 137-145.
For a family with a child showing multiple malformations it is important and of practical significance to determine the repetition risk. For this reason genetic counselling is the part of medical treatment of children with malformation syndromes.
A description of four children with different combinations of multiple anomalies gives an insight into the difficulties in diagnosis and advising on genetic matters in such cases.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 147-151
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
PROBLEMS DE LA PRATIQUE OPHTALMO-GENETIQUE
V. DRINČIĆ
Institut za oftalmologiju Kliničke bolnice Beograda, 11000 Beograd, Jugoslavija
Abstract
Drinčić, V. (1947): Problemes de la pratique ophtalmo - genetique - Genetika, Vol. 6, No. 2, 147-151.
Les problèmes de la pratique dans la génétique ophtalmologique se font jour 'Sous les 'aspects: diagnostico-therapeutiques, sous 1'influence d'examens cliniques compliques et couteux; de la migration et de 1'urbanisation de la population et du conceil génétique dans nos conditions a nous.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 153-159
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
A RARE KARYOTYPE FOUND IN KLINEFELTER SYNDROME
P. ŽEŠKOV i Ljiljana ZERGOLLERN
Klinika za dječje bolesti Rebro, Medicinskog fakulteta Sveučilišta u Zagrebu, 41000 Zagreb, Jugoslavija
Abstract
Žeškov, P. and Zergollern, Lj. (1974): A rare karyotype found in Klinefelter syndrome. - Genetika, Vol. 6, No. 2, 153-159.
Klinefelter syndrome (KS) is a very interesting medical problem due to the variety of genetical and phenotypical variabilities. A case exhibiting a rare karyotype is presented. Rudimentary testes, retarded intellectual development and numerous degenerative stigmata are very frequently present in K.S. It is uncommon that a patient with K.S. shows the symptoms of epilepsy. EEG findings in the examined case show subcortical epileptogenic elements expressed on both temporal regions. Epilepsy is under anticonvulsant control.
The karyotype of the propositus is 49, XXXXY, with X-chromatin positive in 25% cells of buccal smear, mostly in triplo-and rarely in diplo or haploid form.
The karyotypes of the parents and elder brother are morphologically and numerically normal.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 161-167
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
DISTRIBUTION (RANDOM OR NON RANDOM) OF A LATE REPLICATING X CHROMOSOME IN A MAMMALIAN FEMALE COMPLEMENT UNDER IN VIVO CONDITIONS
Marija GUĆ-ČUBRILO and B. GARŽIČIĆ
Laboratorija za humanu citogenetiku, Institut za biološka istraživanja, 11000 Beograd, Jugoslavija
Abstract
Guć-Čubrilo, M. and Garzičić, B. (1974): Distribution (random or non-random) of a late replicating X chromosome in a mammalian female complement under in vivo conditions - Genetika, Vol. 6, No. 2, 161-167.
Hybrid female Lewis-albino x Milck-Hooded rats, with morphologically distinguishable X chromosomes were used for cytogenetical verification of the hypothesis (Lyon, 1961) concerning the activation and inactivation of the X chromosome in mammalian female complemets, namely late and early replication of X chromosome.
Autoradiographic detection of late replicators in an in vivo culture cells, showed non-random distribution of late replication of the X chromosome, in every hybrid female. However, the distribution of late replication of the X chromosome in the whole population is random.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 169-175
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
THE ACTION OF CYTOSINE-ARABINOSIDE ON THE CHROMOSOMES OF HUMAN LYMPHOCYTES FROM PERIPHERAL BLOOD CULTURE IN VITRO
Angelina PETROVIĆ, B. GARZIČIĆ and Milena ĆIRIĆ
Laboratorija za humanu citogenetiku, Institut za biološka istraživanja, 11000 Beograd, Jugoslavija
Abstract
Petrović, A., Garzičić, B. and Ćirić, M. (1974): The action of cytosine-arabinoside on the chromosomes of human lymphocytes from peripheral blood-culture in vitro. - Genetika, Vol. 6, No. 2, 169-175.
During the last few years many investigators studied the chromosomal aberrations caused by 'the influence of cytostatics in vivo and in vitro systems.
Investigation in vitro could solve the problems about specific or nonspecific influence of cytostatics on the chromosome complement as well as on some regions of each chromosome. This would be of great use for mapping of the human chromosome and for studies associated with -the process of their replication.
The influence of an analogous precursor of nucleic acid synthesis, Cytosine-arabinoside (CA) on chromosomes of the human chromosome complement is studied in this work in an in vitro system of peripheral blood culture.
The influence of CA is nonspecific through the whole human chromosome complement. Specificity is demonstrable in 'the exclusive action of CA on the Light bands (G-bands) of the human chromosome complement.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 177-190
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
THE DISTRIBUTION OF TRANSPLANTATION ANTIGENS AND GENES IN YUGOSLAV POPULATION. POPULATION STUDIES
A. KAŠTELAN, V. KERHIN-BRKLJAČIĆ, Lj. BRKLJAČIĆ. P. MAČAŠOVIĆ, Ž. KOVAČ and LJ. ČEČUK
Centar za tipizaciju tkiva Klinike za urologiju Medicinskog fakulteta i Zavod za animalnu fiziologiju Prirodoslovno-matematičkog fakulteta Sveučilišta u Zagrebu, 41000 Zagreb, Jugoslavija
Abstract
Kaštelan, A., Kerhin-Brkljačić, V., Brkljačić, Lj., Mačašović, P., Kovač, Z. and Čečuk, Lj. (1974): The distribution of transplantation antigens and genes in the Yugoslav population Population studies. - Genetika, Vol. 6, No. 2, 177-190.
Three hundred and two unrelated people living in Zagreb and Sarajevo were studied for 25 HL-A antigens using the micro-lymphocytotoxicity test. The results showed that the distribution of HL-A antigens and genes is similar to that found in other European populations. However, antigens W29 and HL-A12 showed some lower frequencies whereas antigen W5 had an increased frequencies. The most frequent haplotypes calculated from the gene frequencies were HL-Al,8; HL-A2,12; HL-A3.W5; HL-A2.W27; HL-A3,7; HL-A11..W5; HL-A2,5 and HL-A10,W18. The haplotype HL-A2,W27 seems to be a typical haplotype in the Yugoslav population.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 191-202
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
DISTRIBUTION OF TRANSPLANTATION ANTIGENS AND GENES IN THE YUGOSLAV POPULATION. FAMILY STUDIES
A. KAŠTELAN, LJ. BRKLJAČIĆ, V. KERHIN-BRKLJAČIĆ, P. MAČAŠOVIĆ, Ž. KOVAČ, LJ. ČEČUK and J. LIGUTIĆ
Centar za tipizaciju tkiva Klinike za urologiju Medicinskog fakulteta i
Zavod za animalnu fiziologiju Prirodoslovno-matematičkog fakulteta Sveučilišta u Zagrebu, 41000 Zagreb, Jugoslavija
Abstract
Kaštelan, A., Brkljačić, Lj., Kerhin-Brkljačić, V., Mačašović, P., Kovač, Ž., Čečuk, Lj. and Ligutić, J. (1974): Distribution of transplantation antigens and genes in the Yugoslav papula, tion. Family studies. - Genetika, Vol. 6, No. 2, 191-202.
Fifty Yugoslav families including 146 siblings were studied in a homogenous fashion for 25 HL-A antigens. The distribution of the most frequent HL-A haplotypes counted in these families was similar to that obtained in other Caucasian populations. From these studies a fully genotyped panel of 100 unrelated subjects was established. A fair correlation between the observed and the expected gene frequencies was obtained. The segregation of individual HL-A genes performed in these families showed an equal repartition of children for most of the HL-A genes studied.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 203-209
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
DIE ZYTOLOGISCHE IDENTIFIZIERUNG VON INDUZIERTEN PISUM TRANSLOKATIONEN
M. MILUTINOVIĆ
Poljoprivredni fakultet, 11000 Beograd - Zemun, Jugoslavia
Abstract
Milutinović, M. (1974): Die zytologische Identifizierung van induzierten Pisum-Translokationen. - Genetika, Vol. 6, No. 2. 203-209.
In der vorliegenden Arbeit wird der Karyotyp von einer röntgeninduzierten Form von Pisum sativum bei den transloka tionsheterozygoten Indlviduen dargestellt und mil dem Karyotyp der Ausgangsform verglichen. Aus den zytologischen Analyse kann man deutliche Unterschiede zwisohen der Vergleichsform und der induzierten Translokationsform 62B fesitstellen, die auf eine einfache reziproke Translokation zurückzuführen ist. An dem Translokatioinsprozess sind längerer Arm von Chromosoni V und satellitentragende Arm von Chromosom VII beteiligt.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 211-222
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
VARIATION IN KERNEL PHENOTYPE AND SOME BIOCHEMICAL PROPERTIES IN OPAQUE 2 FROM DIFFERENT GENETIC BACKGROUNDS
J. DUMANOVIĆ, M. DENIĆ and Kosana KONSTANTINOV
Zavod za genetiku i oplemenjivanje biljaka, INEP, 11080 Zemun, Jugoslavija
Abstract
Dumanović, J., Denić, M. and Konstantinov, K. (1974): Variation in kernel phenotype and some biochemical properties in opaque-2 from different genetic backgrounds. - Genetika, Vol. 6, No. 2, 211-222.
Variation of endosperm texture, resulting from the action of modifier genes, within a number of homozygous opaque-2 converted materials of different genetic backgrounds was studied with respect to: (1) breeding potential of different modified endosperm texture types varying from standard soft o2 to nearly normal dent types, (2) changes in protein content and composition of endosperm in different categories of »normalized« endosperm, and (3) changes in RNase activity at different degrees of endosperm vitreosity.
It is concluded that, in general, the amount of protein is slightly increased, lysine content as percent of protein (and also histidine, arginine, aspartic acid and gycine) somewhat decreased, and content of glutamic acid, leucine and phenylalanine (and perhaps proline and alanine) slightly increased in »normalized« endosperm compared to standard o2 soft floury endosperm. A tendency was indicated for RNase activity to be decreased with increasing proportion of modified (»normalized«) endosperm.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 223-230
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
THE GENETIC VARIATION IN SEED PROTEIN CONTENT AND SOME OTHER BREEDING CHARACTERS IN PISUM MUTANTS AND RECOMBINANTS
H.P. MULLER and S.R. BACQUAR
Institute of Genetics, University of Bonn, 53 Bonn, F. R. Germany
Abstract
Miiller, H.P. and Bacquar, S.R. (1974): The genetic variation, in seed protein content and some other breeding characters in Pisum mutants and recombinants. - Genetika, Vol. 6, No. 2, -.JB, 223-230.
Plant height, thousand kernel weight and protein content rj. of seeds were determined within one year in radiation-induced mutant's of Pisum sativum as well as in some recombinants originating from crosses between the mutants analyzed in order to get an insight into the breeding characters of such genotypes. It was shown that by combining mutated genos new genotypes arise which can be used for further improvement of important agronomic characters.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 231-245
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
GENETIC ANALYSIS IN RESPECT TO PROTEIN CONTENT AND PROTEIN QUALITY IN CHICKPEA (CICER ARIETINUM L.)
V.P. GUPTA, S. RAMANUJAM and A.K. KAUL
Indian Agricultural Research Institute, New Delhi-12, India
Abstract
Gupta, V. P., Ramanujam, S. and Kaul, A. K. (1974): Genetic analysis in respect to protein content and protein quality In chickpea (Cicer arietinum L.). - Genetika, Vol. 6, No. 2, 231-245.
A study of the genetic architecture of protein content and the two limiting aminoacids-methionine and tryptophan in flour as well as in protein, involved the use of different diallel approaches involving five parents. By and large the three approaches to diallele analysis of genetic architecture gave more or less the same assessment. Regarding protein content, methionine content and tryptophan content, additive gene action was predominant though an appreciable portion of nonadditive gene action was also present. For protein content and sulphur content NP 58. for methionine content 5001 AYT and for tryptophan content RS-10 were the best general combiners by bo-th types of analysis The best specific combiners for protein content was RS-10 x 5001 AYT, neither of parents was the lop performer for GCA. The best specific combination for tryptophan content involved P-1713. Similarly the best specific cross for methionine content involved 5001 AYT or P-1713, the top GCA parent.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 247-261
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
STABILITY ANALYSIS IN RESPECT OF PROTEIN, SULPHUR AND PROTEIN VALUE INDEX OF SEED AND ITS IMPLICATION IN ADAPTATION OF CHICKPEA (CICER ARIETINUM L.)
V.P. GUPTA, S. RAMANUJAM and A.K. KAUL
Indian Agricultural Research Institute, New Delhi-12, India
Abstract
Gupta, V. P., Ramanujam, S. and Kaul, A. K. (1974): Stability analysis in respect of protein, sulphur and protein value index of seed aud its implication in adaptation of chickpea (Cicer arietinum L.). - Genetika, Vol. 6, No. 2, 247-261.
In this stability, analysis 35 diverse Cicer arietinum genotypes raised in 6 environments were evaluated for protein content, sulphur content and protein value index of seed. The statistical models used were those due to P e r k i n s and Jinks (1968a, 1968b), and Eberhart and Russell (1966). Joint regression analysis indicated that though most of the genotype x environment interaction could be attributed to differences between the linear slopes of the regressions, there was a certain significant portion which was non-linear. Estimates of environmental additive effects in respect of quality characters revealed that no regular pattern of the environmental effects or better fertilization was visible in their performance. Individual regression analysis revealed that with respect to protein content, 50 percent of the genotypes have a predictable reaction to change in environment. But, with trespect to sulphur content and protein value index, the majority of 'the genotypes have predominant non-linear component of G x E int. so that their behaviour over environments becomes unpredictable. The magnitude and nature of the relationship between various adaptability parameters (μ, + di, βi and S2 di), indicated a general lack of association between stability for yield and quality characters.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 263-275
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
CUMULATIVE GENE EFFECTS AND GENETIC PARAMETERS OF HETEROSIS IN F1 AND F2 GENERATIONS OF CHICKPEAS (CICER ARIETINUM L.).
V.P. GUPTA and S. RAMANUJAM
Indian Agricultural Research Institute, New Delhi 12, India
Abstract
Gupta, V. P. and Ramanujam, S. (1974): Cumulative gene effects and genetic parameters of heterosis in F1 and F2 generation of chickpeas (Cicer arietinum L.). - Genetika, Vol. 6, No. 2, 263-275.
In spite of an extensive hybridization programme carried out during the last two decades in chickpeas (Cicer arietinum L.), a major protein rich legume crop of the world particularly of India, Pakistan and Iran, very limited success has been achieved in yield improvement. Cicer breeders usually adopt only »pick the winner« (types of selection after hybridization but this system of selection is fruitful only if gene action is entirely additive (Cockerham, 1961) which is actually not the case in chickpeas as reported recently by Gupta and Ramanujam (1973). They found through a diallele approach involving F, and F2 generations that non-additive gene-action was more predominant than additive gene-action for yield and its components (except seed size), though the latter was also appreciable. They further found that the relative magnitude of GCA variances/SCA variances in the F2 generation, showed an upward trend in all the environments indicating a consistent presence of a higher order of non-allelic interaction. This necessitates detailed information basic to -the formulation of a rational programme of genetic amelioration. Such information is scanty for chickpeas at present. In this communication, -the results obtained with regard to cumulative gene effects and genetic parameters of heterosis in F1 and F2 generation for yield and its components have been discussed.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 277-281
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
ABSENCE OF SIGNIFICANT DIFFERENCES IN OVERALL NUCLEOTIDE COMPOSITION OF RIBONUCLEIC ACIDS FROM SEVERAL ZEA MAYS VARIETIES
V. LESKOVAC, S. TRIVIĆ, R. INJAC and D. STEPANOV-JERANCE
Department of Chemistry, University of Novi Sad, Akademska 2, 21000 Novi Sad, Yugoslavia
Abstract
Leskovac, V., Trivić, S., Injac, R. and Stepanov-Jerance, D. (1974): Absence of significant differences in overall nucleotide composition of ribonucleic acids from several Zea mays varieties. - Genetika, Vol. 6, No. 2, 277-281.
Overall nucleotide composition of total ribonucleic acids isolated from seedlings of two hybrid maize types and their respective parental inbred lines was determined. It appears that the differences in nucleotide composition of ribonucleic acids from hybrid plants and inbred lines are not significant, and that the overall nucleotide composition of total ribonucleic acids from maize seedlings of five maize varieties which were examined are nearly constant, regardless of genotype.
Published in „GENETIKA“ Vol. 6, No.2 (1974), pp. 283-288
© 1974 Serbian Genetics Society
S. Bajića 1, 11185 Belgrade-Zemun
Serbia
Original scientific paper
RECORD OF A VOLE OF THE MICROTUS ARVALIS GROUP WITH 54 CHROMOSOMES (MICROTUS SUB ARVALIS MEYER, ORLOV ET SKHOLL, 1972) IN YUGOSLAVIA AND COMPARISON OF ITS KARYOTYPE WITH THAT OF PITYMYS FELTENI MALEC ET STORCH, 1963 (RODENTIA, MAMMALIA)
S. ŽIVKOVIĆ and B. PETROV
Institute for Biological Research, 11060 Beograd, Yugoslavia
Abstract
Živković, S. and Petrov, B. (1974): Record oi a vole of the Microtus arvalis group with 54 chromosomes (Microtus subarvalis Meyer, Orlov et Skholl, 1972) in Yugoslavia and comparison of its karyotype with that of Pitymys felteni Malec et Starch, 1963 (Rodentia, Mammalia). - Genetika, Vol. 6, No. 2, 283-288.
In this report the first record of the species Microtus subarvalis in Yugoslavia is reported, as well as the finding of Microtus arvalis with a karyotype of the »arvalis« type. The great similarity of the karyotypes of M. subarvalis and Pitymys felteni is pointed out together with a description of the differences.