The Cell Cycle

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SCIENCE ANIMATION TRANSCRIPT: In this lesson, we'll be looking at the cell cycle. This is the lifespan of a eukaryotic somatic cell. A somatic cell is any cell in the body of an organism, except for sex cells such as sperm and egg cells. The cell cycle describes the sequence of cell growth and division. A cell spends most of its life a state called interphase. Interphase has three phases, the G1, S, and G2 phases. Interphase is followed by cell division, which has one phase, the M phase. Together these four phases make up the entire cell cycle. G1 of interphase is sometimes called growth 1 or gap phase 1. In G1, a cell is busy growing and carrying out whatever function it's supposed to do. Note that some cells, such as muscle and nerve cells, exit the cell cycle after G1 because they do not divide again. A cell enters the S phase after it grows to the point where it's no longer able to function well and needs to divide. The S stands for synthesis, which means to make, because a copy of DNA is being made during this phase. Once DNA replication is complete, the cell enters the shortest and the last part of interphase called G2, also known as growth 2 or gap phase 2. Right now, it's enough to know that further preparations for cell division take place in the G2 phase. Now that interphase is over, the cell is ready for cell division, which happens in the M phase. The M phase has two events. The main one is mitosis, which is division of the cell's nucleus, followed by cytokinesis, a division of the cytoplasm. So, at the end of M phase, you have two daughter cells identical to each other and identical to the original cell. Let's review. The cell cycle describes the life cycle of an individual cell. It has four phases, three in interphase and one for cell division. Most cell growth and function happen during G1. The cell enters the S phase when it needs to divide. In this phase the cell replicates its DNA. Replication just means the cell makes a copy of its DNA. In G2, the cell undergoes further preparations for cell division. Finally, we have cell division in the M phase. The M phase consists of mitosis, which is nuclear division, and cytokinesis, or division of the cytoplasm. We'll explore the details of mitosis and cytokinesis separately. [music]
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This was a nice “big picture” overview of the cell cycle.

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[@surajmaurya1238]

Wrong animation in G1phase and s -phase and G2 phase dna is not found in condensed form it is present in nucleus in form of chromatin first time dna condensation start in Prophase of M-phase

[@california4775]

True

[@jivikakulkarni5929]

yes correct and it bothers me that they showed S phase longer than G1, whereas G1 is the longest phase

[@DheerajPatel-wp4hn]

And G1 phase is the longest phase in entire cell cycle.

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😭thnku so much i was confuse between g1 phase and s phase of chromosomes but not now thnku again😭😭

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Tq

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should have used a diploid cell to illustrate

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[@ishikajain3668]

Can we say that the cell becomes 4n in S phase?

[@jivikakulkarni5929]

there is no increase in chromosome number or the entire genotype would change but the amount of DNA per cell doubles so if the initial DNA were, say, 2C, after S phase, it becomes 4C, but the chromosome number stays the same, say, n for haploid cells or 2n for diploid cells

[@sidrakhalid9165]

The nucleus is visible when cell is:
Dividing
Not dividing
Resting
All these

[@jivikakulkarni5929]

nucleus is visible at any time while viewing a cell but if you say chromosomes then it is the metaphase

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G0?

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Great visual - Question: Aren't all somatic cells an even number - 1/2 from the egg and 1/2 from the sperm? Shouldn't there always be an even number of chromosomes for a Cell Cycle?

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Yes, typically, but it is important to note that exceptions can occur due to genetic abnormalities.

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2n=3?

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They have it at grade 8 science here

[@mbh5360]

The mitotic phase has two stages : Karyokinesis and Cytokinesis. There's a bit of wrong explanation.

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complete video of meiosis

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100%

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When does the cell death happen, this video is incomplete

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In s phase does chromosomes duplicate?

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No.

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😊...Sir, G1 phase is the longest phase of cell cycle..... Am i right...?🙄

[@jivikakulkarni5929]

yes

[@ismilkhan9659]

nope it took 9 hours where as S phase took 10 so S is the longest phase

[@jivikakulkarni5929]

@@ismilkhan9659 G1 is the longest phase, if we're talking about humans, then G1 takes 11 hours, S takes 8, G2 takes 4 and M takes 1 hour

[@user-dt2dk8mn7r]

No.. Interphase is longest phase which include G1, S & G2.

[@jivikakulkarni5929]

@@user-dt2dk8mn7r yes and within interphase, G1 is the longest

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Please explain with urdu

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Man cell cycle is in too brief

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I was forced to watch this in school:(

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