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QuestionBiology

Describe the four steps of mitosis: Prophase: Metaphase: Anaphase: Telophase:

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Step 1:

Prophase: During prophase, the first step of mitosis, the chromosomes condense and become visible. Each chromosome is made up of two sister chromatids, which are genetically identical and tightly bound together. The nuclear envelope begins to break down, allowing the chromosomes to move freely within the cell. Additionally, the mitotic spindle begins to form, made up of microtubules that will eventually separate the sister chromatids. \text{Prophase: Chromosomes condense and become visible; nuclear envelope breaks down;} \ \text{mitotic spindle forms.}

Step 2:

Metaphase: In metaphase, the chromosomes align at the metaphase plate, an imaginary line equidistant from the two spindle poles. This alignment is crucial for accurate chromosome separation during the next phase. The kinetochores, protein structures on the centromeres of each chromosome, attach to the spindle fibers, allowing the chromosomes to be pulled apart. \text{Metaphase: Chromosomes align at the metaphase plate;} \ \text{kinetochores attach to spindle fibers.}

Step 3:

Anaphase: Anaphase is marked by the separation of the sister chromatids, now referred to as daughter chromosomes. The spindle fibers connected to the kinetochores shorten, pulling the daughter chromosomes toward opposite poles of the cell. As the daughter chromosomes move apart, the cell elongates in preparation for division into two daughter cells. \text{Anaphase: Daughter chromosomes separate;} \ \text{spindle fibers pull chromosomes toward opposite poles;} \ \text{cell elongates.}

Step 4:

Telophase: Telophase is the final step of mitosis. The separated daughter chromosomes reach the spindle poles and begin to decondense, becoming less visible. New nuclear envelopes form around each set of chromosomes, marking the completion of mitosis. The cell then undergoes cytokinesis, dividing the cytoplasm and creating two genetically identical daughter cells. \text{Telophase: Daughter chromosomes reach spindle poles;} \ \text{nuclear envelopes form around each set of chromosomes;} \ \text{cell undergoes cytokinesis, creating two daughter cells.}

Final Answer

The four steps of mitosis are Prophase, Metaphase, Anaphase, and Telophase. These steps involve the condensation and separation of chromosomes, the formation of the mitotic spindle, and the division of the cell into two genetically identical daughter cells.

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