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Meiosis | Cell division | Biology (article) | Khan Academy Cells move from meiosis I to meiosis II without copying their DNA Meiosis II is a shorter and simpler process than meiosis I, and you may find it helpful to think of meiosis II as “mitosis for haploid cells "
Phases of meiosis II (video) | Heredity | Khan Academy Meiosis II is a process that helps cells divide and create gametes, which are needed for sexual reproduction It starts with prophase II, where the nuclear envelope dissolves and chromosomes condense Then, in metaphase II, chromosomes line up along the cell's middle
Phases of meiosis I (video) | Heredity | Khan Academy Now each of those two chromosomes do have two sister chromatids, and as we'll see in meiosis II, which is very similar to mitosis, is going to split up the sister chromatids from each of these chromosomes, which gives us two daughter chromosomes
Meiosis review (article) - Khan Academy On the other side, during meiosis I, same as mitosis, they are split into 2 cells, each of which has 46 chromosomes (46 sister chromatids in total) So, during meiosis II, these 2 cells was split again into 4 cells, each of which has 23 chromosomes (23 sister chromatids in total)
Aneuploidy chromosomal rearrangements - Khan Academy At the end of meiosis I, there will be 2 haploid daughter cells, one with n+1 and the other with n-1 Both of these daughter cells will then go on to divide once more in meiosis 2, producing 4 daughter cells, 2 with n+1 and 2 with n-1
Comparing mitosis and meiosis (video) | Khan Academy Meiosis II takes place to separate each of those sister chromatids so that the chromosomes of each gamete at the end will have only a single chromatid This separation process also introduces further genetic variety since which sister chromatid goes to which cell is decided randomly
Mitosis (article) | Cellular division | Khan Academy There are two ways cell division can happen in humans and most other animals, called mitosis and meiosis When a cell divides by way of mitosis, it produces two clones of itself, each with the same number of chromosomes When a cell divides by way of meiosis, it produces four cells, called gametes
Phases of meiosis I (video) | The Cell Cycle | Khan Academy Now each of those two chromosomes do have two sister chromatids, and as we'll see in meiosis II, which is very similar to mitosis, is going to split up the sister chromatids from each of these chromosomes, which gives us two daughter chromosomes
Chromosomal crossover in meiosis I (video) | Khan Academy Meiosis is a process where germ cells divide to produce gametes, such as sperm and egg cells In prophase I of meiosis, chromosomes condense and homologous recombination takes place, leading to genetic variation through chromosomal crossover
What is Down syndrome? (article) | Khan Academy Egg cells that are ready to be fertilized are temporarily stuck meiosis I, and won't go into meiosis II until fertilized (which is different from sperm cells!)