ISSN:1424-8581    

DOI:10.1159/000131599

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

H-Y antigen was investigated in three amphibian species with different degrees of sex-chromosome differentiation: Bujo bufo, Triturus vulgaris, and Pyxicephalus adspersus. No heteromorphic sex chromosomes were found in B. bujo, but an examination of the progeny of hermaphrodites (Ponse, 1942) indicated that the female of this species was heterogametic (ZW). Sex chromosomes differing only by a very small heterochromatic region at their telomeres were found in the male of T. vulgaris (XY). Pyxicephalus adspersus revealed highly differentiated ZW sex chromosomes. The results of the H-Y antigen studies on these three species indicate that H-Y antigen is expressed only in the heterogametic sex, irrespective of differences in morphological differentiation of the sex chromosomes. Therefore, H-Y antigen could be a valuable tool in determining the heterogametic sex, not only in Amphibia but possibly also in other vertebrate species that have either evolved no heteromorphic sex chromosomes or where sex-reversal experiments are not possible.

ISSN:1424-8581    

DOI:10.1159/000131600

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

In 38 independent hamster-bovine hybrids, the segregation of 17 bovine enzyme markers was studied. The results showed three syntenic groups; LDHB-PEPB-TPI, PGM3-ME1-SOD2, and PGD-ENOl, whereas nine other markers did not show any syntenic relationship: LDHA, MDH2, LDH1, SOD1, PKM2, PGM1, PGM2, AK1, and MPI.

ISSN:1424-8581    

DOI:10.1159/000131601

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

Sister chromatid exchange (SCE) frequency was studied in human/hamster hybrid lines in which the human cells had been exposed to gamma irradiation at doses of 0, 10, 20, and 40 grays. A higher SCE frequency was found in the hamster chromosomes in the hybrid lines than was found in the hamster parental cell line CHW1103. There was also a dose-dependent increase of SCE frequency in the unirradiated hamster chromosomes in the hybrid lines in which the human parental cells had been irradiated.

ISSN:1424-8581    

DOI:10.1159/000131602

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

Histological and cytogenetic examinations of testicular preparations from a male hybrid between an Indian muntjac × Chinese muntjac showed a certain degree of chromosomal homology, as evidenced by the synaptic behavior. The male hybrid is considered sterile because spermatogenetic stages were arrested at early prophase. Silver staining demonstrated that the nucleolus organizer regions of both parents were expressed, but no synaptonemal complex and sex vesicle were observed

ISSN:1424-8581    

DOI:10.1159/000131603

出版商:S. Karger AG    

年代:1981

数据来源: Karger

摘要:

Epididymal spermatozoa from 12 species of mammals were stained using silver nitrate and examined with the light microscope. Silver nitrate differentiates many of the gross morphological features of spermatozoa, including the acrosome, subacrosomal region, perforatorium, postacrosomal sheath, neck, dense outer fibers of the core of the midpiece, annulus, principal piece, and end piece. Silver-staining patterns of spermatozoa reveal both species-specific and strain-specific differences, particularly of the sperm head. The biochemical basis of silver staining may be due in part to the presence of sulfhydryl- and disulfide-rich proteins; however, it cannot be explained entirely by the presence of these moieties. The detail obtained using silver nitrate staining, coupled with the ease and rapidity of the procedure, should be useful to workers in many areas of biological and medical research.

ISSN:1424-8581    

DOI:10.1159/000131604

出版商:S. Karger AG    

年代:1981

数据来源: Karger

ISSN:1424-8581    

DOI:10.1159/000131605

出版商:S. Karger AG    

年代:1981

数据来源: Karger

ISSN:1424-8581    

DOI:10.1159/000131606

出版商:S. Karger AG    

年代:1981

数据来源: Karger

ISSN:1424-8581    

DOI:10.1159/000131607

出版商:S. Karger AG    

年代:1981

数据来源: Karger

ISSN:1424-8581    

DOI:10.1159/000131608

出版商:S. Karger AG    

年代:1981

数据来源: Karger