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- hey, john did you know the stages of meiosis,but before i tell you that you must know that there are two divisions in meiosis. The first divison is called meiosis I and the other one is meiosis II
- no but i do know what is meiosis
- Centrosome movement, spindle formation, and nuclear envelope breakdown occur. Chromosomes condense progressively throughout prophase I. also Duplicated homologous chromosomes (red and blue) pair up and exchange segments. and During early prophase I, each chromosome pairs with its homolog, aligned gene by gene, and crossing over occurs at chiasmata: The DNA molecules of non-sister chromatids are broken (by proteins) and are rejoined to each other.
- owsh awesome
- for now lets just talk about meosis the first stage is phropase I
- Pairs of homologous chromosomes are now arranged at the metaphase plate, with one chromosome of each pair facing each pole. ● Both chromatids of one homolog are attached to kinetochore microtubules from one pole; the chromatids of the other homolog are attached to microtubules from the opposite pole.
- the next stage is metaphase I
- wow i didn't know about that,amazing
- now lets move on to the third stage of meoisis I that is called anaphase I
- it's really interesting
- Breakdown of proteins that are responsible for sister chromatid cohesion along chromatid arms allows homologs to separate. and the homologs move toward opposite poles, guided by the spindle apparatus. also Sister chromatid cohesion persists at the centromere, causing chromatids to move as a unit toward the same pole. Write to Stephanie Enaje
- When telophase I begins, each half of the cell has a complete haploid set of duplicated chromosomes. Each chromosome is composed of two sister chromatids; one or both chromatids include regions of nonsister chromatid DNA. Cytokinesis usually occurs simultaneously with telophase I, forming two haploid daughter cells. (In animal cells a cleavage furrow forms. In plant cells, a cell plate forms.) In some species, chromosomes decondense and nuclear envelopes form.
- and the last stage of meiosis I, telophase I
- During the second round of cell division, the sister chromatids finally separate, and four haploid daughter cells result, containing unduplicated chromosomes. The spindle fiber starts to form at the opposite poles of the cell. In late prophase II, chromosomes, each still composed of two chromatids associated at the centromere, are moved by microtubules toward the metaphase II plate. Write to Stephanie Enaje
- so, what it is?
- now lets start about the other division that is meiosis II
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