Meiosis
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Meiosis is a type of cell division that produces gametes with half the number of chromosomes as the original parent cell. It involves two rounds of cell division, meiosis I and meiosis II. In meiosis I, homologous chromosome pairs separate and are distributed into two daughter cells, reducing the chromosome number by half. Meiosis II then separates the sister chromatids, resulting in four daughter cells each containing a single set of non-identical chromosomes derived from the original parent cell.
Meiosis
- 1. MEIOSIS
- 2. 1. WHAT IS MEIOSIS? Meiosis is a special type of cell division that produces gametes with half as many chromosomes. The steps in meiosis are similar to mitosis and even have the same names. However, there is a significant difference. Meiosis consists of two successive cell divisions: - Meiosis I ( Reductional division ), during which the number of chromosomes is reduced into half (from 2n to n) -Meiosis II ( Equational division), during which the chromosomes are separated into two chromatids. Meiosis II is almost the same as mitosis.
- 3. Interphase is the same in both mitosis and meiosis, but in meiosis, it is followed by two cell divisions. In prophase I, the chromosome are formed. They come together and match up in pairs (tetrads). In metaphase I, the tetrads line up on the equatorial plate, not individual chromosomes. In anaphase I, the homologous chromosomes separate, and one of each pair travels to each of the two poles of the cell. In telophase I, two daughter cells are formed. They go immediately into the second cell division (meiosis II), without passing through
- 4. Meiosis II is pretty much like mitosis, in that the sister chromatids are separated. This results in four daughter cells, each with an n number of chromosomes.