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: Hi everyone : I'm a third year biology student.. : I had a lab on Drosophila flies & i wanted to know what is the duration of the cell cycle in Drosophila, especially in the (saliva cells) cells of the late prepupal salivary gland (polyploid chromosomes)? : Any help whould be great : Even links to relevant sites. : P.S : The only stuff i found is bellow but it doesn't contain time for each phase: : (from http://sdb.bio.purdue.edu/fly/aimorph/puffing.htm) : In dividing diploid cells the DNA synthetic phase (S phase) is regularly followed by mitosis (M phase). The cell cycle includes of G1, S, G2, M phases. : In certain cirstances, the M phase does not follow the S phase, and repeated cycles of DNA synthesis results in polyploidy. The process of recurrent duplication cycle without consequent mitosis is called endoreduplication. Instances of polyploid chromosomes in Drosophila include different cells like cells of the late prepupal salivary gland. : During the process of polyploidization, chromosomes become multistranded. In Drosophila the degree of polyteny is estimated to be approximately 1024 in salivary gland chromosomes, about 512 in each homolog.

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