CHROMOSOME STUDIES OF CULTURED CELLS OF 2 SPECIES OF SIDE-NECKED TURTLES (PODOCNEMIS UNIFILIS AND P EXPANSA)

被引:23
作者
HUANG, CC
CLARK, HF
机构
[1] N.Y. State Department of Health, Springville Laboratories, Roswell Park Memorial Institute, Springville, N.Y.
[2] Department of Pediatrics, School of Medicine, State University of New York at Buffalo, Buffalo, New York
[3] Wistar Institute, Philadelphia, 19104, Pa.
关键词
D O I
10.1007/BF00326519
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The diploid chromosome number of two species of sidenecked turtles (Podocnemis unifilis and P. expansa) was found to be 28. Under normal culture conditions, half of the chromosomes of P. unifilis consistently show one or two clear secondary constrictions. In P. expansa, the incidence of cells with chromosomes bearing secondary constrictions and the number of such chromosomes per cell are less. Cells of two P. unifilis cell lines maintained a normal diploid karyotype for two years following their initiation. Then one cell line shifted to a hypodiploid mode of 27 and half of the population of the second line became pseudodiploid, the other half remaining diploid. A single six-month-old cell line from P. expansa has maintained a normal diploid mode through 10 passages. © 1969 Springer-Verlag.
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页码:245 / &
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