By CIBA Foundation Symposium

ISBN-10: 0470514574

ISBN-13: 9780470514573

ISBN-10: 0471942642

ISBN-13: 9780471942641

Connects classical mobile descriptive stories with newer paintings at the molecular and genetic features concerning germline improvement. favorite scientists talk about examine on a variety of organisms together with bugs, worms, birds, fish, amphibia, mammals and eco-friendly algae. Specification of germ cells, their migration to the gonads and next interactions with the soma and evolutionary elements in their segregation are one of the themes lined.


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Example text

Dixon: M. Okada has shown that the mitochondrial large ribosomal RNA transcript can rescue UV-irradiated Drosophila (Kobayashi & Okada 1989).

After the L4 to adult moult, the gonad converts from spermatogenesis to oogenesis. In males, the germline also undergoes extensive proliferation and the first cells to enter meiosis differentiate into sperm. However, males never switch to oogenesis but instead produce sperm throughout adulthood. Immunofluorescent staining of germ granules, termed P granules in C. elegans, has revealed that they are maternally supplied to the zygote and are partitioned to the small P cell at each of the early asymmetric divisions (Fig.

Kirk: The only situation where this happens is either in the sexual male, or mu1 (‘multiple gonidia’) C or muf D mutants. In these, all cells cleave asymmetrically and then stop cleaving (Kirk et a1 1991). Kimble: Are there no mutants that allow the vegetative cells to d o this? Kirk: There are no mutants which permit the entire programme of wild-type cleavage to proceed except for causing all cells to cleave asymetrically. We have some in which three-quarters of the cells cleave asymmetrically.

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Ciba Foundation Symposium 182 - Germline Development by CIBA Foundation Symposium

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