By Wilfried Janning (auth.), Professor Dr. W. J. Gehring (eds.)
ISBN-10: 354035803X
ISBN-13: 9783540358039
ISBN-10: 3662219522
ISBN-13: 9783662219522
The courting of cellphone lineage and differentiation is likely one of the so much interesting difficulties in developmental biology. In so much better organisms, the research of the telephone lineage has to depend upon oblique equipment. in basic terms within the most fitted structures, just like the nematodes, can the development of phone department be made up our minds through direct remark lower than the microscope. In circumstances the place this isn't attainable, the destiny of the cells should be tested through the use of mobile markers. most fitted for this function are genetic markers, only if they don't intrude with the developmental pathway to be studied. besides the fact that, compatible genetic markers and strategies for producing genetic mosaics are available a number of organisms in simple terms. hence, this quantity is essentially fascinated by Drosophila and the mouse, which were studied such a lot generally. In 1929 STURTEVANT brought the research of gynandromorphs into devel opmental genetics. although, this significant contribution remained mostly disregarded until eventually the overdue sixties, while the possibility of this system for deter mining embryonic destiny maps and the variety of primordial cells used to be exploited, and the technique prolonged to the mapping of mutational foci. Mitotic recombination was once demostrated via STER:-< in 1936, who discovered the possibility of this system for the research of phone lineage and trend formation. The usefulness of this technique was once considerably elevated by means of the invention of FRIESEN that mitotic recombination could be prompted via x-irradiation. this enables the induction of mosaicism at any degree of development.
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Additional resources for Genetic Mosaics and Cell Differentiation
Example text
7. The expression of variegation can be modulated by the parental genotype. 5) is involved. 2). In the other case, Dp(l ;3 )w 264 - 58 ", a small w+ -carrying section of chromosome 1 is inserted into the heterochromatic region at the base of chromosome 3 (Demerec, 1940; Sutton, 1940). , w258 - 18/w or wjw; w264 - 58 ", show variegated eyes. Some sections of the eyes are normally pigmented, others are a very light shade of red (w 258 - 18 jw) or white (wjw; w264 - 58 " ). Since the eyes of w+ jw flies are normal, the transposed w+ loci are considered partially suppressed by the adjacent heterochromatin.
Dev. Bioi. : Mosaic analysis of lethal mutations in Drosophila. Genetics 75, 623 -637 ( 1973) Catches ide, D. , Lea, D. : Dominant lethals and chromosome breaks in ring X-chromosomes of Drosophila melanogaster. J. Genet. : Determination of blastoderm cells in Drosophila melanoyaster. Proc. Nat!. A cad. Sci. : A fate map of larval organs of Drosoflhila and pre blastoderm determination. : A computer program automating construction of l~tte maps of Drosophila. Dev. Bioi. 53, 142-146 (1976) Flanagan).
Temperature has repeatedly been claimed to influence the frequency of mitotic recombination, particularly by Stern and Rentschler (1936) and by Brosseau (1957). In some cases it increased, in others it decreased the frequency; there is, so far, no evidence that it acts consistently in one direction. Spontaneous spermatogonial (Stern and Doan, 1936; Lindsley, 1955) and oogonial mitotic recombination (Neuhaus, 1936) were inferred to have taken place in cases where recombinants appeared in clusters of identical phenotypes.
Genetic Mosaics and Cell Differentiation by Wilfried Janning (auth.), Professor Dr. W. J. Gehring (eds.)
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