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 The cell cycle https://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/a/cell-cycle-phases 2021-04-29T07:59:20Z Phases of the cell cycle The cell cycle is composed of interphase (G₁, S, and G₂ phases), followed by the mitotic phase (mitosis and cytokinesis), and G₀ phase. article 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/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 The cell cycle https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:the-cell-cycle-and-differentiation/x230b3ff252126bb6:the-cell-cycle-and-mitosis/a/the-cell-cycle-and-mitosis 2026-03-18T10:10:31.931963487Z The cell cycle and mitosis Learn about the stages of interphase and the mitotic (M) phase of the cell cycle. article 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/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-cycle/e/mitosis-questions 2025-06-04T06:57:25.860760525Z Mitosis questions Use these questions to check your understanding of mitosis! Emily exercise https://www.khanacademy.org/science/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-cycle/e/the-cell-cycle-and-mitosis-class-11-biology 2026-04-07T22:23:57.656416987Z The cell cycle and mitosis This exercise has questions on the different phases of the cell cycle and of mitosis. Moumita Sen exercise 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 The cell cycle 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 The cell cycle 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 The cell cycle 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/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-cycle/e/meiosis-class-11-biology 2026-04-08T01:15:04.085520103Z Meiosis This exercise has questions on meiosis. Moumita Sen exercise https://www.khanacademy.org/science/exam-preparation-class-11th-biology/x0c1a8c25d3e07544:week-2/x0c1a8c25d3e07544:cell-cycle-and-cell-division/e/cell-cycle-and-cell-division 2026-04-07T23:55:07.30621384Z Cell Cycle and Cell Division This exercise is on the cell cycle and cell division process. Nivedhitha exercise