Blog Feb. 5th
February 2, 2010
List and explain the stages of interphase and mitosis.
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•1 phase: The period prior to the synthesis of DNA., the cell increases in mass in preparation for cell division.
•2 phase: The period during which DNA is synthesized. In most cells, there is a narrow window of time during which DNA is synthesized. Note that the S represents synthesis.
•3 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size.
•Phase 4: In the latter part of interphase, the cell still has nucleoli present.
•Phase 5: The nucleus is bounded by a nuclear envelope and the cell’s chromosomes have duplicated but are in the form of chromatin.
•Phase 6; In animal cells, two pair of centrioles formed from the replication of one pair are located outside of the nucleus.
G1 phase: The period prior to the synthesis of DNA. In this phase, the cell increases in mass in preparation for cell division. Note that the G in G1 represents gap and the 1 represents first, so the G1 phase is the first gap phase.
S phase: The period during which DNA is synthesized. In most cells, there is a narrow window of time during which DNA is synthesized. Note that the S represents synthesis.
G2 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size. Note that the G in G2 represents gap and the 2 represents second, so the G2 phase is the second gap phase.
Interphase occurs before mitosis and there are three phases: 1. G1 phase – cell increases in mass, 2. S phase – DNA is synthesizd. 3. G2 phase – The cell synthesizes protein and continues to increase in size.
mitosis is a cell division in which the nucleus divides into nuclei containing the same number of chromosomes,interphase is the first part of all 6 stages
The mitosis starts the nuclear membrane dissolves.Chromosomes condense intro rodike structures.Then the chromosomes line up along the equarter of the cell.Homologous Chromosomes pair up..Then the chromatids seperate and move to opposite sides of the cell..then a nuclear membrane forms around each set of chromosomes,and the chromosomes unwind.Mitosis is complete..
the stages of interphase is copying DNA before mitosis begins chromosomes are copied. Each chromosomes is then two chromatids.
he stages of interphase and mitosis are;
Prophase
Metaphase
Anaphase
Telophase
Interphase
G1 phase – the cell is functionally normally and begins to grow in size. The nuclear envelope begins to break down.
S (Synthesis) phase – the cells DNA replicates
G2 phase – The cell ensures that the correct number of chromosomes and organelles are present. If so, Interphase ends and cell division continues.
Mitosis
1. Interphase
DNA has replicated, but has not formed the condensed structure of chromosome. They remain as loosely coiled chromatin.
2. Prophase
Forming of chromosomes. The nuclear membrane and nucleolus are no longer visible.
The spindle apparatus has migrate to opposite poles of the cell.
3. Metaphase
The spindle fibres attach themselves to the centromeres of the chromosomes and align the the chromosomes at the equatorial plate.
4. Anaphase
The spindle fibres shorten and the centromere splits, separated sister chromatids are pulled along behind the centromeres.
?
4. Telophase
The chromosomes reach the poles of their respective spindles. Nuclear envelope reform before the chromosomes uncoil. The spindle fibres disintegrate.
In mitosis it starts with a brnd new cell. then it has the mitochondria split. Then that cell makes another cell.
Interphase
The cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.
Mitosis
Mitosis is nuclear division plus cytokinesis, and produces two identical daughter cells during prophase, prometaphase, metaphase, anaphase, and telophase. Interphase is often included in discussions of mitosis, but interphase is technically not part of mitosis, but rather encompasses stages G1, S, and G2 of the cell cycle.
Cell cycle is growing mitosis is just spliting. ???
1.Interphase occurs before mitosis and there are three phases.
G1 phase – cell increases in mass.
S phase – DNA is synthesizd.
G2 phase – The cell synthesizes protein and continues to increase in size.
The mitosis starts the nuclear membrane dissolves.Chromosomes condense intro rodike structures.Then the chromosomes line up along the equarter of the cell.Then a nuclear membrane forms around each set of chromosomes,and the chromosomes unwind.Mitosis is complete.
The stages of interphase and mitosis are;
Prophase
Metaphase
Anaphase
Telophase
the motois have 6 stages dna, mass, cell cyle it is spiting
mitosis is the cell division that causes cells to split into two daughter cells.Mitosis starts at the cell membrane while chromosomes move along rodlike structures.Interphase have four stages- Metaphase, Telephase, anaphase,and prophase
interphase
g1phase= the cell inceases in mass
sphase= synthesised dna
g2phase cell synthesiszis protein and continues to increase in size
G1 phase: The period prior to the synthesis of DNA. In this phase, the cell increases in mass in preparation for cell division. Note that the G in G1 represents gap and the 1 represents first, so the G1 phase is the first gap phase.
S phase: The period during which DNA is synthesized. In most cells, there is a narrow window of time during which DNA is synthesized. Note that the S represents synthesis.
G2 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size. Note that the G in G2 represents gap and the 2 represents second, so the G2 phase is the second gap phase.
Interphase occurs before mitosis and there are three phases: 1. G1 phase – cell increases in mass, 2. S phase – DNA is synthesizd. 3. G2 phase – The cell synthesizes protein and continues to increase in size.
Interphase is where chromosomes and organelles are copied. Mitosis is where the cell divides.
The stages of interphase and mitosis:
The stages in which Mitosis is divided into are;
* Interphase- In this phase the cell prepares it’self for divison. Interphase is not a stage in Mitosis, it is just a phase of a cell cycle however it is important in Mitosis. Interphase is the stage of the cell or nucleus when it is not in mitosis, hence comprising most of the cell cycle. Before Mitosis it goes through this growth phase and spends most of it’s time here. G1, synthesis and G2 are the three phases here.
* Prophase- First nucleus membrane separates and becomes two. Chromosone divides into two forming an X
* Prometaphase- sometimes considered to be part of prophase, membrane completely breaks apart and microtubules start going inside the nuclear space. “open mitosis” seen in multicellular organisms not unicellular
* Metaphase- the spindle that was formed reaches the climax and the chromosomes start aligning themselves in a phase called Metaphase plane, which is at equal distance from the two poles of the spindle. It is here that the nuclear membrane completely disintegrates and the centrioles that are four in number place themselves in a set of two at the opposite poles. Polar fibers can still be found which extend across the length of the cell from one pole to the other. Chromosomes are at right angles to the spindle poles and are held by forces of the same level of polar fibers.
* Anaphase- chromosomes move to opposite ends of the nuclear.
* Telophase- Short phase which results in the formation of two cells each with one member of each homologous pair plus is still composed of two chromatids.
Interphase
DNA has replicated, but has not formed the condensed structure of chromosome. They remain as loosely coiled chromatin.The nuclear membrane is still intact to protect the DNA molecules from undergoing mutation.
Mitosis
Prophase
In prophase, the chromatin condenses into discrete chromosomes. The nuclear envelope breaks down and spindles form at opposite “poles” of the cell.
Metaphase
In metaphase, the chromosomes are aligned at the metaphase plate (a plane that is equally distant from the two spindle poles).
Anaphase
In anaphase, the paired chromosomes (sister chromatids) move to opposite ends of the cell.
Telophase
In this last stage, the chromosomes are cordoned off in distinct new nuclei in the emerging daughter cells. Cytokinesis is also occurring at this time.
At the end of mitosis, two distinct cells with identical genetic material are produced.
G1 phase: The period prior to the synthesis of DNA. In this phase, the cell increases in mass in preparation for cell division. Note that the G in G1 represents gap and the 1 represents first, so the G1 phase is the first gap phase.
S phase: The period during which DNA is synthesized. In most cells, there is a narrow window of time during which DNA is synthesized. Note that the S represents synthesis.
G2 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size. Note that the G in G2 represents gap and the 2 represents second, so the G2 phase is the second gap phase.
prophase
Metaphase
Anaphase
Telophase
1.) G1 phase: The period prior to the synthesis of DNA. In this phase, the cell increases in mass in preparation for cell division. Note that the G in G1 represents gap and the 1 represents first, so the G1 phase is the first gap phase.
S phase: The period during which DNA is synthesized. In most cells, there is a narrow window of time during which DNA is synthesized. Note that the S represents synthesis.
G2 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size. Note that the G in G2 represents gap and the 2 represents second, so the G2 phase is the second gap phase