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 Cycle and Cell Division 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 Cycle and Cell Division 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 Cell Cycle and Cell Division 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 Cycle and Cell Division https://www.khanacademy.org/science/revision-term-1-ka-biology-grade-11/x1474e0ca4285b2f5:week-3/x1474e0ca4285b2f5:cell-cycle-and-cell-division/v/how-chromosomes-separate-in-meiosis 2024-06-20T05:53:08.664932393Z How Chromosomes Separate in Meiosis Confused on what separates during different stages of meiosis I and II? Watch this hands-on video to understand how diploid cells give rise to haploid cells via meiosis. Nivedhitha Suresh video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw How Chromosomes Separate in Meiosis Confused on what separates during different stages of meiosis I and II? Watch this hands-on video to understand how diploid cells give rise to haploid cells via meiosis. https://cdn.kastatic.org/ka-youtube-converted/HmqA5IoYwew.mp4/HmqA5IoYwew.mp4 314 Cell Cycle and Cell Division 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