This helps to create genetic diversity. Anaphase 1 is where the bivalents separate and the homologous chromosomes move to opposite poles of the cell. Telophase 1 is where the nuclear envelope reforms after disintegrating in prophase 1. Then cytokinesis is where the cell divides to create two new cells which are haploid (GENIE, 2010). The next main stage is meiosis 2 and this is where each chromosome is split into 2 sister chromatids.
Comparing Mitosis and Meiosis with reference to i. Chromosomesii. Biological significance i. Chromosomes ii. Biological significance Modern cell theory states that all cells are derived from other cells. This means cells must have a way of copying themselves. This is cell division; two types of cell division are Meiosis and Mitosis.
To replicate, the cell goes through cell division. That is also known as mitosis. That is when one parent cell produces two daughter cells. Imagine, what would Earth be without DNA?
Instead of lining up on a metaphase, as in mitosis, chromosomes come together in pairs (2). Each chromosome in a pair is similar in structure (homologous), but would have come originally from different parents. Later in propha... ... middle of paper ... ...hese daughter chromosomes then begin to separate from each other, each moving away from the metaphase plate and toward one of the two spindle pole regions. The mechanisms that control chromosome separation clearly involve the interactions between microtubules and components in or near the kinetochore. Sometime after anaphase onset, the chromosomes have moved close to the spindle pole regions, and the spindle middle begins to clear.
Telophase I and cytokinesis: The chromosomes finished their move to the opposite poles of the cell. At each pole of the cell a full set of chromosomes get together. A membrane forms around each set of chromosomes to create two new nuclei.Then single cell pinches in the middle to form two separate daughter cells in which each contain a full set of chromosomes within a nucleus. This process is known to be cytokinesis. Meiosis II 6.
Spindle fibers attach to the centromeres. In anaphase, the sister chromatids are pulled toward opposite poles. In telophase, the chromosomes condense, and a new nuclear envelope forms around the groups of chromosomes. The nucleoli and nuclear envelope reappear and in cytokinesis, the cytoplasm divides into two cells, which are both diploid and genetically identical. 2.
Meiosis unlike mitosis has two cell divisions, Meiosis I and Meiosis II. In prophase I of meiosis I, the chromosomes begin by pairing with its homolog and this is also where crossing over occurs. In this stage just like prophase in mitosis the nuclear envelope breaks down and the mitotic spindle begins to develop as well. In Metaphase I the homologue chromosomes line up at the metaphase plate and the kinetochore microtubules attach to both ends of the chromosome. In anaphase I the homologs move to opposite ends of the poles and the homologs also begin to separate as well.
The next stage is metaphase 2 the chromosomes line up along the center of the cell before it breaks up into two. Then the chromatids point towards the opposite ends of the cell. The next stage is anaphase 2. This is the second to last phase in meiosis and it has many events that happen. The first event is when the sister chromatids separate and move towards the opposite ends of the pole.
In eukaryotic organisms, there are two types of cellular divisions that take place within the body. The first type being mitosis and the second being meiosis. Mitosis is what happens when the cell’s nucleus divides into two identical daughter cells. Meiosis is the process that creates four daughter cells that each has half the number of the original chromosomes as the original parent cell. While the products for these processes are different there are some similar aspects, that each has in common with one another.
Once the cells have reached the opposite sides of the cell, the cell then begins to pinch in the middle; this is called telophase I. Once cytokinesis has occurred the cells will have completely separated into two haploid daughter cells. The process of meiosis II occurs the same as meiosis I except now within the two daughter cells that were a result of meiosis I. Meiosis II begins with prophase II and then progresses through each of the following stages until cytokinesis and the result is four daughter