lesson
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Right now, your body loses around 50 million skin cells every single day, yet you never run out of skin.
Every replacement cell comes from an existing cell dividing through an ordered series of events called the cell cycle.
DNA Inside the Nucleus
Inside the nucleus of every eukaryotic cell, genetic instructions are stored in long molecules of DNA packaged into structures called chromosomes.
Human body cells contain 46 chromosomes, arranged in 23 pairs—one chromosome in each pair inherited from your mother and one from your father.
📊Create an interactive visual showing DNA packaging into a chromosome. At the top, show a double helix unwinding into a thin strand of DNA. In the middle, show histone proteins wrapping the DNA into chromatin fibers. At the bottom, show the dense, rod-shaped chromosome with clear labels for 'DNA Double Helix', 'Histone Proteins', and 'Condensed Chromosome'. Include a callout badge: 'Human Body Cells: 23 Pairs (46 Chromosomes total)'. Use clean card style with blue (#22b7ff) accents, dark slate text (#1e2945), and smooth hover highlights.
How does a single cell prepare all this genetic material before it can safely split in two?
The Three Main Stages of the Cell Cycle
The eukaryotic cell cycle is divided into three major stages: Interphase (growth and DNA replication), Mitosis (nuclear division), and Cytokinesis (cell splitting).
Cells spend roughly 90% of their total cycle time in Interphase, preparing everything necessary for a successful division.
📊Create a pie-chart style circular diagram representing the eukaryotic cell cycle. The large sector (~90%) is labeled 'Interphase' in teal/blue, divided into three sub-phases: 'G1 (Growth & Organelle synthesis)', 'S (DNA Replication)', and 'G2 (Preparation for division)'. The smaller sector (~10%) is colored in coral/orange and labeled 'M Phase: Mitosis & Cytokinesis'. Clicking or hovering over each sector reveals a tooltip summary of what happens in that stage. Clean responsive layout with modern typography.
What exact changes take place during that massive preparation period?