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Fig. 1. Cell cycles at the time of fertilisation. The maternal egg activation sequence takes the Drosophila egg from metaphase I of meiosis to the first mitotic metaphase in the absence of fertilisation. Gnu, Plu and Pan gu proteins are essential to terminate the prezygotic S-phase and to establish the first zygotic mitosis. Fertilisation is required for the first mitotic anaphase because the spindle is organized by the daughters of the centrosome accompanying the paternal (grey) chromosomes; chromosomes only undergo this mitotic anaphase and undertake the subsequent mitotic cycles when attached to a spindle.





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