state the important events taking place during s p h a s e in an animal cell
Answers
In animal cells, during the S phase, DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm..............
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interphase
During interphase, the cell copies its DNA in preparation for mitosis. This phase is divided into 3 shorter phases : G1, S and G2.
G1 : During this phase, the cell grows in preparation for DNA replication. Cellular components such as organelles and centrosomes are replicated.
S : S is the phase where the DNA packed into chromosomes is duplicated. Replication of DNA by a certain enzyme is essential as it allows each cell created by the division to have the exact same genetic make-up. At the end of this phase, the cell contains twice its genetic material.
G2 : During this phase, a certain enzyme checks and corrects any error in the duplication of the genetic material.
Mitosis
During mitosis, the cell is split into two independent and identical cells. Mitosis is divided into 4 shorter phases : prophase, metaphase, anaphase and telophase.
Prophase : The chromosomes start to condense and the nucleolus disappears. The nuclear envelope breaks down.
Metaphase : Chromosomes align at the metaphase plate which is the centre of the cell.
Anaphase : Chromatids of each chromosome are separated and start migrating towards opposite poles of the cell.
Telophase : Nuclear membranes reappears, one for each set of chromosomes. Chromosomes decondense.
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