High School Biology Help » Cell Biology » Cell Division » Mitosis » Understanding Stages of Mitosis

Crossing over occurs in anaphase at each pole of the cell where the chromosomes are packed together.

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Crossing over occurs in telophase right before the cells split since all the DNA and cell growth has occurred by this point.


Crossing over occurs in metaphase when all the chromosomes are aligned in the middle of the cell. Their close proximity allows crossing over to occur.


Explanation:

Mitosis is cellular cloning. This means that Mitosis ends with two identical cells; no variation. Mitosis is how the body repairs skin and other tissues. Because the tissue being repaired needs to match its neighboring cell, there is no need for variation which is exactly what crossing over does. It mixes-n-matches the genetic material amongst chromosomes, which helps to give rise to the variation we see amongst our own species and in all animals that reproduce sexually (Meiosis). 


In which stage of mitosis do sister chromatids line up along an imaginary line that divides the cell in half?


Explanation:

Metaphase is characterized by the lining up of chromosomes along the "metaphase plate," an imaginary line that divides the cell in half. Following metaphase and during anaphase, the sister chromatids will separate and move towards the poles of the cell.


Mitosis and meiosis are similar and often incorrectly thought of as the same process. Which of these best explains their differences? 


Mitosis will generate 4 daughter cells with half the genetic material from the parent cell, while meiosis will generate two daughter cells with the same genetic material from the parent cell.


Mitosis will generate two daughter cells with the same genetic material from the parent cell, while meiosis will generate 4 daughter cells with half the genetic material from the parent cell. 


Correct answer:

Mitosis will generate two daughter cells with the same genetic material from the parent cell, while meiosis will generate 4 daughter cells with half the genetic material from the parent cell. 


Explanation:

There are many ways that mitosis and meiosis differ, in this question we are primed to look at the differences in the end products of each type of cell division.

Mitosis creates two new cells that are identical to the parent cell (diploid). Meiosis creates 4 new cells with half the genetic information (haploid) in each cell, and the cells are nonidentical to the parent cell and to their sister cells.


Explanation:

Prophase- spindles forming, chromosomes condense, and the nuclear membrane begins to break down

Prometaphase- microtubules grow

Metaphase- chromatids are lined up in the center of the cell on the equatorial plate

Anaphase- the two chromatids of the chromosome are pulled apart at the centromere

Telophase- new nuclear membranes form around each set of chromosomes, the spindles break down, and chromosomes decondense


Which stage of mitosis exhibits the two chromatids of the chromosome are pulled apart at the centromere?


Explanation:

Prophase- spindles forming, chromosomes condense, and the nuclear membrane begins to break down

Prometaphase- microtubules grow

Metaphase- chromatids are lined up in the center of the cell on the equatorial plate

Anaphase- the two chromatids of the chromosome are pulled apart at the centromere

Telophase- new nuclear membranes form around each set of chromosomes, the spindles break down, and chromosomes decondense


Explanation:

Prophase- spindles forming, chromosomes condense, and the nuclear membrane begins to break down

Prometaphase- microtubules grow

Metaphase- chromatids are lined up in the center of the cell on the equatorial plate

Anaphase- the two chromatids of the chromosome are pulled apart at the centromere

Telophase- new nuclear membranes form around each set of chromosomes, the spindles break down, and chromosomes decondense


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Explanation:

Interphase would be first as this is the part of the cycle cycle that the cell prepares to enter Mitosis. The key indicators of prophase are that the nuclear envelope is still intact and the chromosomes are beginning to pair up sister chromatids. The mitotic spindle is also beginning to form. Premetaphase, the next phase, is when the spindle has attached itself to the respective chromosomes and they begin to migrate to the center of the cell. In Metaphase the chromosomes have lined up on the mitotic plate and beginning to separate. In anaphase each sister chromatid moves to its respective side of the cell, as it is being pulled there by the mitotic spindle. The last phase of mitosis is telophase, which is indicated by the beginning of the cell splitting into two, called cytokinesis.


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Example Question #18 : Understanding Stages Of Mitosis


At which phase of mitosis are the chromosomes separated and move to each side of the cell?


Possible Answers:

Prophase


Anaphase


Metaphase


Telophase


Premetaphase


Correct answer:

Anaphase


Explanation:

Anaphase is where the duplicated chromosomes split, disconnected at the centromere, and each sister chromatid is moved towards opposite sides of the cells. 


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Example Question #19 : Understanding Stages Of Mitosis


Telophase is the next phase in mitosis. List two things that occur during this phase. 


Possible Answers:

The spindles begin to develop and pull each set of chromosomes to opposite sides of the cell.


The nuclear envelope begins to breakdown and the chromosomes begin to move to opposite sides of the cell.


Chromosome sets are assembled at opposite ends of the cell and a nuclear envelope forms around the chromosomes. 


Chromosomes are lined up in the middle of the cell and the nuclear envelope begins to form.


Chromosomes are lined up in the center of the cell and the mitotic spindle begins to pulls them towards either side of the cell.


Correct answer:

Chromosome sets are assembled at opposite ends of the cell and a nuclear envelope forms around the chromosomes. 


Explanation:

Important indications that the cell is in telophase are that the chromosomes have been moved towards the opposite sides of the cell. The nuclear envelope does begin to form around the new respective nucleus of each daughter cell and the cell itself begins the stages of cytokinesis, or this splitting of the cell into two daughter cells.

See more: Where Does The Scarlet Ibis Come From In "The Scarlet Ibis"?


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Example Question #20 : Understanding Stages Of Mitosis


What term refers to the cell splitting into two daughter cells?


Possible Answers:

Fission


Telophase


Cytokinesis


Anaphase


Interphase


Correct answer:

Cytokinesis


Explanation:

Cytokinesis is the division of the cell into two respective daughter cells. Cytokinesis can start as early as anaphase and moves through with telophase. The most important thing in this part of the process is to make sure that there is one nucleus in each new cell being formed. A protein filament ring, called the contractile ring, causes the middle of the cell to shrink and pinch off to form the two separate daughter cells.


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