2007-11-11 06:27:46 · 8 answers · asked by V 1 in Science & Mathematics ➔ Biology
the chromosomes are duplicated as dna, and the dna replication occurs during the interphase. Then, the chromatin condenses into chromosomes in prophase. I don't know what you mean by G1 and G2, but that it what I know, and then the chromosomes split into their chromatids during anaphase when the spindle fibers pull it. During telephase, the new nuclear envelope forms around each area of chromatin, and this concludes mitosis.
2007-11-11 06:33:25 · answer #1 · answered by Anonymous · 0⤊ 3⤋
The chromosomes duplicate in the S (synthesis) phase. The centriole duplication begins in late G1 or early S phase.
2014-10-13 08:21:38 · answer #2 · answered by Feissal 1 · 0⤊ 0⤋
The DNA is still a single copy during G1.
DNA replicates during S which immediately follows G1.
So DNA is already duplicated during G2.
2007-11-11 06:32:38 · answer #3 · answered by ecolink 7 · 1⤊ 0⤋
Similar to other cell-cycle events, chromosome duplication and segregation are chiefly driven by cyclin-dependent kinases (CDKs) and a ubiquitin ligase known as the anaphase-promoting complex or cyclosome (APC/C). Immediately after cell division, cells are in the G1 phase of the cell cycle with low CDK activity. Rising levels of S-phase CDKs induce entry into S phase, and then the M-phase CDKs drive entry into mitosis. During early M phase, sister chromatid pairs (each comprising one of the sister DNA strands plus associated proteins) are captured by microtubules that emanate from opposite ends of the cell. During late mitosis, the APC/C bound by its activator Cdc20 (Peters, 2002) triggers separation of sister chromatids, causing their segregation to opposite poles of the cell. The APC/C also degrades cyclins, thereby lowering CDK activity and promoting exit from M phase. The cell then pinches into two parts, each containing a full complement of chromosomal DNA.
here is more info for you if you need it ... Very good site : http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1371039
2007-11-11 06:31:38 · answer #4 · answered by jennifer j 3 · 0⤊ 0⤋
no, they are duplicated in the S phase, which stands for synthesis. The G phases are growth periods
2007-11-11 06:32:53 · answer #5 · answered by tulipeliza 3 · 1⤊ 1⤋
ok the chromsomes can be seen they align in pairs which are homologous then they duplicate
2016-05-29 05:34:02 · answer #6 · answered by ? 3 · 0⤊ 0⤋
yes
2007-11-11 06:29:55 · answer #7 · answered by Anonymous · 1⤊ 1⤋
ya
i learned it science.
2007-11-11 06:31:00 · answer #8 · answered by Anonymous · 0⤊ 1⤋