https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/v/mitosis 2023-12-04T19:02:25.924542584Z Mitosis Mitosis, a key part of the cell cycle, involves a series of stages (prophase, metaphase, anaphase, and telophase) that facilitate cell division and genetic information transmission. Centrosomes and microtubules play pivotal roles in orchestrating this complex process, ensuring the successful replication of cells. Sal Khan video https://cdn.kastatic.org/googleusercontent/TDqHqMvXm2B_9p-M1hqSnT1mRmZHzNMDGtwhJXBdf0z5rkPddF3WRsWlDXzLpz7vf2fZeOPeqJiHv3gyvXjhFsd8 Mitosis Mitosis, a key part of the cell cycle, involves a series of stages (prophase, metaphase, anaphase, and telophase) that facilitate cell division and genetic information transmission. Centrosomes and microtubules play pivotal roles in orchestrating this complex process, ensuring the successful replication of cells. https://cdn.kastatic.org/ka-youtube-converted/TKGcfbyFXsw.mp4/TKGcfbyFXsw.mp4 732 Cell division https://www.khanacademy.org/science/grade-11-biology-snc-aligned/x58c107ba92d3f0b2:domain-d-cells-and-sub-cellular-organelles/x58c107ba92d3f0b2:cell-division/e/cellular-division-questions 2024-10-21T18:33:15.929799516Z Cellular division questions Cellular division questions Kyle exercise https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/phases-of-mitosis 2021-04-29T07:50:02Z Phases of mitosis How a cell divides to make two genetically identical cells. Prophase, metaphase, anaphase, and telophase. article https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/v/interphase 2023-12-04T19:02:25.924542584Z Interphase A cell spends most of its life in interphase, which has three phases: G1, S, and G2. In the G1 phase, the cell grows and takes in nutrients. In the S phase, the cell's DNA is replicated. Each replicated chromosome consists of two sister chromatids connected at the centromere. The G2 phase is another growth phase, after which the cell is ready for mitosis. Sal Khan video https://cdn.kastatic.org/googleusercontent/5cKOAL0qb8cL7pVX_f2Z_nRFhJlc_Lb9Il-srg_adRBBxpIJmncE9dDsgerAu0k-HbC0Q_E9t0mck0VckouXBvI Interphase A cell spends most of its life in interphase, which has three phases: G1, S, and G2. In the G1 phase, the cell grows and takes in nutrients. In the S phase, the cell's DNA is replicated. Each replicated chromosome consists of two sister chromatids connected at the centromere. The G2 phase is another growth phase, after which the cell is ready for mitosis. https://cdn.kastatic.org/ka-youtube-converted/VXLSTd_dlKg.mp4/VXLSTd_dlKg.mp4 508 Cell division https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/e/cell-cycle-exercise 2025-05-06T03:35:40.836086657Z Cell cycle Test your knowledge of the cell cycle! Lauren Rosebrugh exercise https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/dna-and-chromosomes-article 2021-04-29T07:55:56Z Chromosomes DNA, chromosomes, and genomes. Homologous chromosomes, sister chromatids, and haploid/diploid. article https://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/v/comparing-mitosis-and-meiosis 2023-09-10T17:11:17.624018169Z Comparing mitosis and meiosis Mitosis and meiosis are two different types of cell division. Mitosis occurs in somatic cells and results in two identical daughter cells with a diploid (2n) number of chromosomes. This process is essential for growth and repair in the body. On the other hand, meiosis occurs in germ cells and produces four non-identical gametes with a haploid (n) number of chromosomes. These gametes, such as sperm and egg cells, are crucial for sexual reproduction and genetic diversity. Sal Khan video https://cdn.kastatic.org/googleusercontent/fUQXPwlmBn3Ht4p8-EKLnts_AUh_BSZfZsdO2wf8Z03ud8BFjq_8_TmUpefD3PTUcl9rdjalF5aizcmrg5wetljNhg Comparing mitosis and meiosis Mitosis and meiosis are two different types of cell division. Mitosis occurs in somatic cells and results in two identical daughter cells with a diploid (2n) number of chromosomes. This process is essential for growth and repair in the body. On the other hand, meiosis occurs in germ cells and produces four non-identical gametes with a haploid (n) number of chromosomes. These gametes, such as sperm and egg cells, are crucial for sexual reproduction and genetic diversity. https://cdn.kastatic.org/ka-youtube-converted/IQJ4DBkCnco.mp4/IQJ4DBkCnco.mp4 351 Cell division https://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/v/phases-of-meiosis-i 2023-09-10T17:11:17.624018169Z Phases of meiosis I In meiosis I, cells go through four phases: prophase I, metaphase I, anaphase I, and telophase I. During prophase I, chromosomes pair up and exchange genetic material, creating more variation. In metaphase I, chromosomes line up in the middle of the cell. Anaphase I separates homologous pairs, while telophase I forms two new cells with a haploid number of chromosomes. Sal Khan video https://cdn.kastatic.org/googleusercontent/kF68gKxy_f5Ufz66szLJIK2Y6iOCxUNfGAea3J3T_v4vZ35rCUaAByLX4Xii-5jRpnd9GduVJIyse9NeYlMZiPofMQ Phases of meiosis I In meiosis I, cells go through four phases: prophase I, metaphase I, anaphase I, and telophase I. During prophase I, chromosomes pair up and exchange genetic material, creating more variation. In metaphase I, chromosomes line up in the middle of the cell. Anaphase I separates homologous pairs, while telophase I forms two new cells with a haploid number of chromosomes. https://cdn.kastatic.org/ka-youtube-converted/XGWL9jfPHJ8.mp4/XGWL9jfPHJ8.mp4 585 Cell division https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:inheritance-and-variation-of-traits/x230b3ff252126bb6:meiosis/e/understand-meiosis 2026-04-02T04:15:35.616513959Z Understand: meiosis Check your understanding of meiosis in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/v/phases-of-meiosis-ii 2023-09-10T17:11:17.624018169Z Phases of meiosis II 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. During anaphase II, sister chromatids separate and move to opposite ends of the cell. Finally, in telophase II, the nuclear envelope reforms, and the cell splits into four new cells, each with a haploid number of chromosomes. Sal Khan video https://cdn.kastatic.org/googleusercontent/2MZjJQ4JytlRXF7W89Cpfrqb0WSC0bLbr79fjutvWK2kWurKMndBOQHTcNepzvkpBiTJbDyq5YJjkhYo5vKwNOk Phases of meiosis II 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. During anaphase II, sister chromatids separate and move to opposite ends of the cell. Finally, in telophase II, the nuclear envelope reforms, and the cell splits into four new cells, each with a haploid number of chromosomes. https://cdn.kastatic.org/ka-youtube-converted/mMCcBsSAlF4.mp4/mMCcBsSAlF4.mp4 658 Cell division https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:inheritance-and-variation-of-traits/x230b3ff252126bb6:meiosis/e/apply-meiosis 2024-06-28T21:00:15.59562973Z Apply: meiosis Apply your understanding of meiosis in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/a/phases-of-meiosis 2024-06-28T21:00:15.59562973Z Meiosis Learn about the intricacies of meiosis: chromosome reduction, crossing over, and more. article https://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/v/chromosomal-crossover-in-meiosis-i 2023-09-14T11:22:40.102153098Z Chromosomal crossover in meiosis I 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. This forms a tetrad, which is made up of four chromatids (two sister chromatids per chromosome). Sal Khan video https://cdn.kastatic.org/googleusercontent/psK-SXXmGmEgFbcsXqGFcFzxeISQE5UOch7140SY4rw72J2577ffgYYSg_za8sG3AT9Sm10Tgk-6selPwL2w9YIh Chromosomal crossover in meiosis I 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. This forms a tetrad, which is made up of four chromatids (two sister chromatids per chromosome). https://cdn.kastatic.org/ka-youtube-converted/04gQ0bQu6xk.mp4/04gQ0bQu6xk.mp4 736 Cell division