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Fig. 1 | Cilia

Fig. 1

From: Drosophila melanogaster as a model for basal body research

Fig. 1

The fruit fly as a cell and evolutionary biology model organism to study basal bodies. a Phylogenetic relationships of the insects whose genomes have been sequenced. Green indicates genomes that have been fully sequenced (more than 8× coverage), blue indicates genomes, where the sequencing has not been completed (less than 8× coverage). The sequenced genomes cover about 350 million years of insect evolution. From: http://www2.bio.ku.dk/insect_genomics/project/. b Diagrams, not to scale, of a variety of ciliated cells that grow morphologically different cilia in the adult fly. c Schematic representation of Drosophila spermatogenesis. A germline stem cell after division gives rise to a gonial cell that in turn undergoes four rounds of incomplete mitotic divisions to produce a 16-cell cyst of interconnected primary spermatocytes. Primary spermatocytes go through a long G2 phase when centrioles/basal bodies elongate and migrate to the cell membrane where each centriole grows a cilium. Each spermatocyte then undergoes two consecutive meiotic divisions without either DNA replication or basal body duplication. As a result, each early spermatid harbours one basal body that templates the sperm flagellum axoneme

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