Mitosis and meiosis?

Question

What is the definition?
What is the purpose?

What phase is responsible for the purpose of meisosis?

Answer 1

(m)

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.
Interphase & mitosis 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.

Prophase

Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes. The nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the mitotic spindle.

Prometaphase

The nuclear membrane dissolves, marking the beginning of prometaphase. Proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.

Metaphase

Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.

Anaphase

The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.

Telophase

Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei. The chromosomes disperse and are no longer visible under the light microscope. The spindle fibers disperse, and cytokinesis or the partitioning of the cell may also begin during this stage.

Cytokinesis

In animal cells, cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus. In plant cells, the rigid wall requires that a cell plate be synthesized between the two daughter cells.

MEIOSIS

Meiosis is the type of cell division by which germ cells (eggs and sperm) are produced. Meiosis involves a reduction in the amount of genetic material.

Meiosis comprises two successive nuclear divisions with only one round of DNA replication.
Four stages can be described for each nuclear division.

Interphase: Before meiosis begins, genetic material is duplicated.
First division of meiosis
Prophase 1: Duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. Crossing-over can occur during the latter part of this stage.
Metaphase 1: Homologous chromosomes align at the equatorial plate.
Anaphase 1: Homologous pairs separate with sister chromatids remaining together.
Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the homologous pair.

Second division of meiosis: Gamete formation
Prophase 2: DNA does not replicate.
Metaphase 2: Chromosomes align at the equatorial plate.
Anaphase 2: Centromeres divide and sister chromatids migrate separately to each pole.
Telophase 2: Cell division is complete. Four haploid daughter cells are obtained.
One parent cell produces four daughter cells. Daughter cells have half the number of chromosomes found in the original parent cell and with crossing over, are genetically different.

Meiosis differs from mitosis primarily because there are two cell divisions in meiosis, resulting in cells with a haploid number of chromosomes.

Answer 2

mitosis and meiosis are almost the same processes of cell division. however with mitosis the cells that are produced from the parent cell will be identical and have the exact same number of chromosomes. but with meiosis, the cells that result from division are not identical to the parent cell and have half the number of chromosomes- this is because the main factor for meiosis is the production of gametes (ie. sperm and eggs). they must have half the number of chromosomes (23) because during fertilization the sperm haploid cell and the egg haploid cell unite and 23+23 will give u the 46 chromosomes that are in a normal cell.

meiosis has multiple phases. meiosis I (and also 2) consists of prophase 1, metaphase 1, anaphase 1, and telophase 1.

Answer 3

Meiosis is the process of cell division whereby a diploid eukaryotic cell divides to give four haploid daughter cells.
Mitosis is the process of cell division whereby a cell divides to form two identical daughter cells.

Purpose:
Meiosis is necessary for formation of gametes which are used in sexual reproduction
Mitosis is useful in cell regeneration and growth and also asexual reproduction.

In Meiosis the phase responsible for its purpose is Prophase 1 during which each chromosome splits in two and crossing over occurs. This is responsible to make sure that each daughter cell receives half the number of chromosomes as the parent and also due to crossing over, it brings about variation in the chromosomal composition of daughter cells.

Answer 4

Mitosis is a cell division process where the nucleus divides in, typically, four stages. There's prophase, metaphase, anaphase, and telophase. It results in two nuclei and both contain a complete copy of the parantel chromosome. I remembered it in a dumb way by saying MiTOsis is miTWOsis or something. It helped anyways.
Meiosis is another process of cell division but in sexually reproducing organisms that reduces the number of chromosomes in reproductive cells fro diploid to haploid. It leads the production of gametes in animals and spores in plants.
It's a bit hard at first, but you just have to memorize everything.

Answer 5

Mitosis is the cell division of normal cells like skin cells blood cells.
Meiosis is the cell division of sex cells like sperm and eggs.

Answer 6

of path they are able to modern-day technique greater divisions and that they proceed to divide until they grow to be ineffective! Mitotic cellular divides into 2 according to cellular cycle each and each cellular divides into 4 for the time of meiosis cycle