User:McKenzie Porter/sandbox

Meiosis is a specialized type of cell division that reduces the chromosome number by half. This process occurs in all sexually reproducing single-celled and multicellular eukaryotes, including animals, plants, and fungi. disabilities. Meiosis Meiosis Phase I Prophase I Metaphase I Anaphase I Telephase I Meiosis Phase II Prophase II Metaphase II Anaphase II Telophase II Four Haploid Cells

In meiosis I, chromosomes in a diploid cell re-segregate, producing four haploid daughter cells. It is this step in meiosis that generates genetic diversity.

Prophase I Duplicated chromosomes condense. Homologous chromosomes pair up and chiasmata occur as chromatids of homologues exchange parts. The nuclear enveloped disintegrates and spindle micotubules form.

Metaphase I Paired Homologous chromosomes aligned along the equator of the cell. One homologue of each pair faces the pole of the cell. Then attaches to spindle microtubules via its kinetochore.

Meiosis II is similar to mitosis. However, there is no "S" phase. The chromatids of each chromosome are no longer identical because of recombination. Meiosis II separates the chromatids producing two daughter cells each with 23 chromosomes (haploid), and each chromosome has only one chromatid. Prophase II If chromosomes have after telophase I, they recondense. Spindle microtubules reform and attach to     the sister chromatids. Metaphase II Chromosomes line up along the equator, with chromatids of each Chromosomes attached to spindle microtubules that lead to opposite poles. Anaphase II Chromatids separate into independent daughter chromosomes, One former chomatid moves toward each pole. Telophase II Chromosomes finish moving to opposite poles. Nuclear envelopes re-form. Chromosmes become extended again.

Mitosis is a process where a single cell divides into two identical daughter cells (cell division). Mitosis was found by Walther Flemming at the University of Kiel published the results of his investigations of the process of cell division and the distribution of chromosomes to the daughter nuclei, a process he called mitosis from the Greek word for thread. In the interphase the cell grows and prepares to divide into two cells. In the prophase the structures are called spindle fibers form a bridge between the ends of the cell. Then the nuclear membrane breaks down. In the metaphase spindle fibers from the centrioles becomes, attached to the centromeres of each chromosome. In the anaphase the spindle fibers shorten and pull the individual chromosomes toward centrioles. In the telephase the chromosome begin to stretch and separate. In the cytokinesis stage each daughter cell ends up with the same number of identical chromosomes and about half the organelles and cytoplasm that the original cell had. The mitosis cycle is a process where a single cell divides into two identical daughter cells (cell division). There are six different phases in this process. The first one in the interphase. It matures the cell and makes a copy of it DNA. Next is the proshase. That's when the chromatin in the nucleus condenses to form chromosomes and the nuclear membrane breaks down. Afterwards is the metaphase where the spindle fibers from the centrioles becomes, attached to the centromeres of each chromosome. In the anaphase the duplicated chromosomes(chromatids) are seperated. Later in the telophase The chromosome begin to stretch and separate. Lastly in the cytokinesis the cell finally splits into two.