<P> The ensuing S phase starts when DNA synthesis commences ; when it is complete , all of the chromosomes have been replicated , i.e. , each chromosome has two ( sister ) chromatids . Thus , during this phase , the amount of DNA in the cell has effectively doubled , though the ploidy of the cell remains the same . Rates of RNA transcription and protein synthesis are very low during this phase . An exception to this is histone production , most of which occurs during the S phase . </P>
<P> The ensuing S phase starts when DNA synthesis commences ; when it is complete , all of the chromosomes have been replicated , i.e. , each chromosome has two ( sister ) chromatids . Thus , during this phase , the amount of DNA in the cell has effectively doubled , though the ploidy of the cell remains the same . Rates of RNA transcription and protein synthesis are very low during this phase . An exception to this is histone production , most of which occurs during the S phase . </P>
in which phase of cell cycle are chromosomes replicated
in which phase of cell cycle are chromosomes replicated
S phase
S phase