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Step 1:I'll solve this problem about anaphase of the cell cycle with a clear, step-by-step explanation:
Step 2:: Understanding Anaphase
Anaphase is a critical stage in cell division (mitosis or meiosis) where chromosomes are separated and pulled to opposite poles of the cell. This occurs after metaphase and before telophase.
Step 3:: Key Chromosome Movements
During anaphase, two major events occur: - Sister chromatids are pulled apart - Each set of chromosomes moves to opposite ends of the cell
Step 4:: Molecular Mechanism
- The spindle fibers (microtubules) attached to the kinetochores of chromosomes begin to shorten - These microtubules pull the sister chromatids in opposite directions - Each chromatid is now considered a separate chromosome
Step 5:: Types of Anaphase
There are two types: - Anaphase I (in meiosis): Homologous chromosomes separate - Anaphase II (in mitosis and meiosis II): Sister chromatids separate
Step 6:: Protein Involvement
- Separase enzyme breaks protein complexes holding sister chromatids together - Microtubules from the mitotic spindle provide the pulling force
Final Answer
During anaphase, sister chromatids are pulled apart by spindle fibers to opposite poles of the cell, preparing for cell division and ensuring each daughter cell receives identical genetic material.
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