What is the best description of the chromosomes by the end of metaphase of mitosis?
The chromosome pairs collect in a line across the middle of the cell.
How many chromosomes are at the end of metaphase 2?
The spindle fibers will move the chromosomes until they are lined up at the spindle equator. Metaphase II: During metaphase, each of the
23 chromosomes
line up along the center of the cell at the metaphase plate. Anaphase II: During anaphase II, the centromere splits, freeing the sister chromatids from each other.
What happens to the chromosomes during metaphase 2?
In metaphase II,
the chromosomes line up individually along the metaphase plate
. In anaphase II, the sister chromatids separate and are pulled towards opposite poles of the cell. In telophase II, nuclear membranes form around each set of chromosomes, and the chromosomes decondense.
What happens to the chromosomes during mitosis 2?
During this multistep process,
cell chromosomes condense and the spindle assembles
. The duplicated chromosomes then attach to the spindle, align at the cell equator, and move apart as the spindle microtubules retreat toward opposite poles of the cell.
What happens during metaphase stage 2 of mitosis?
The second phase of mitosis is metaphase, in which
the chromosomes move into the equatorial plane of the spindle
. As the third phase—anaphase—begins, the chromatids separate and move to opposite ends of the cell. Once the chromatids separate, they are called chromosomes.
What can happen if cells do not duplicate correctly?
The cell’s DNA is copied during the synthesis phase. … If the cell has not properly copied its chromosomes, an enzyme called cyclin dependent kinase, or CDK, will not activate the cyclin, and the cell cycle will not proceed to the next phase. The
cell will undergo cell death
.
What happens during Pmat I and II?
Both Meiosis I and II have the same number and arrangement of phases: prophase, metaphase, anaphase, and telophase.
Both produce two daughter cells from each parent cell
. … Meiosis II starts with two haploid parent cells and ends with four haploid daughter cells, maintaining the number of chromosomes in each cell.
How many chromosomes are visible at the end of mitosis?
At the end of mitosis, the two daughter cells will be exact copies of the original cell. Each daughter cell will have
30 chromosomes
.
What stage do 2 haploid daughter cells form?
During
telophase I
, the chromosomes are enclosed in nuclei. The cell now undergoes a process called cytokinesis that divides the cytoplasm of the original cell into two daughter cells. Each daughter cell is haploid and has only one set of chromosomes, or half the total number of chromosomes of the original cell.
How many chromosomes are in each phase of mitosis?
Once mitosis is complete, the cell has
two groups of 46 chromosomes
, each enclosed with their own nuclear membrane. The cell then splits in two by a process called cytokinesis, creating two clones of the original cell, each with 46 monovalent chromosomes.
What happens to DNA in each stage of mitosis?
During telophase, the
newly separated chromosomes reach the mitotic spindle and a nuclear membrane forms around each set of chromosomes
, thus creating two separate nuclei inside the same cell. As Figure 4 illustrates, the cytoplasm then divides to produce two identical cells.
Why do chromosomes coil during mitosis?
Why do chromosomes coil during mitosis? … E)
The chromosomes are “reeled in” by the contraction of spindle microtubules
, motor proteins of the kinetochores move the chromosomes along the spindle microtubules, and nonkinetochore spindle fibers serve to push chromosomes in the direction of the poles.
How many daughter cells are created at the end of meiosis 2?
As soon as the cytoplasm divides, meiosis is complete. There are now
four daughter cells
— two from each of the two cells that entered meiosis II — and each daughter cell has half the normal number of chromosomes (Figure 7).
What is the importance of metaphase 2?
Metaphase II in Meiosis
This is the phase where the two daughter cells produced during the first meiotic division,
have their meiotic spindles start to draw the chromosomes to the metaphase plate
, again. This is to prepare the centrosome for division in the next phase.
What are the stages of metaphase?
Metaphase is
the phase of mitosis that follows prophase and prometaphase and precedes anaphase
. Metaphase begins once all the kinetochore microtubules get attached to the sister chromatids’ centromeres during prometaphase.
How do you know if its metaphase 1 or 2?
The key difference between metaphase 1 and 2 is that in metaphase 1, homologous chromosomes pair up at the metaphase plate while in metaphase
2, single chromosomes line up at the metaphase plate
. … Each nuclear division can be subdivided again into Prophase, Metaphase, Anaphase and Telophase.
