Where does mitosis occur in the human body, and what are its two main steps?, ✮Mitosis occurs in somatic cells and stem cells of the body.✮ Its two main steps are Karyokinesis (nuclear division) and Cytokinesis (cytoplasmic division)., What is Karyokinesis? Name its first stage., ✮Karyokinesis is the process of nuclear division where the genetic material is equally split.✮The first stage of karyokinesis is Prophase., Which cellular structures disappear by the end of Prophase?, The nuclear membrane, the nucleolus, and organelles such as the Golgi complex and Endoplasmic reticulum disappear by the end of Prophase., Describe what happens to the centrioles during Prophase., During Prophase, the duplicated centrioles move toward opposite poles of the cell to initiate the formation of spindle fibers., Explain the major changes that occur in the chromosomes and the nucleus during Prophase of mitosis., During Prophase of mitosis, the following changes occur:✮Condensation: Chromosomes, which are originally thin, loose, thread-like chromatin, start to condense (shorten and thicken) and become clearly visible as distinct structures with sister chromatids joined at a centromere.✮Centriole Migration: Outside the nucleus, the centriole pair duplicates, and they migrate to opposite poles of the cell, initiating spindle fiber assembly.✮Disintegration: The nuclear membrane and the nucleolus disintegrate and gradually disappear completely by late prophase. Organelles like the Golgi apparatus and Endoplasmic reticulum also fade away., Differentiate between Karyokinesis and Cytokinesis., ✮Karyokinesis: It is the division of the cell nucleus. It consists of four complex nuclear stages (Prophase, Metaphase, Anaphase, Telophase) that ensure equal separation of chromosomes.✮Cytokinesis: It is the division of the cytoplasm of the cell. It follows karyokinesis, physically dividing the parent cell's cytoplasmic content into two distinct daughter cells.

Mitosis (Prophase)

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