Cell Growth and Division; Reproduction

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Subject: Biology

Semester: 2

Period: 4

Week: 19

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School Name:
Teacher’s Name:
Subject: Biology
Grade Level: Grade 11
Date: Week 19
Lesson Duration: 45 minutes
Week & Term: Week 19, Period IV
Topic: Cell Growth and Division; Reproduction
Sub-topic: Cell Cycle & Phases of Mitosis

 

Learning Objectives

By the end of the lesson, learners will be able to:

1. Describe the stages of the cell cycle.
2. Explain and illustrate the phases of mitosis.
3. Understand the importance of mitosis in growth and tissue repair.
4. Identify the differences between interphase and cell division phases.
5. Use diagrams to label and differentiate stages of mitosis.

 

Previous Knowledge

Students already know basic knowledge about cells, including organelles and their functions (from junior classes).

 

Instructional Materials

• Diagrams or slides of the cell cycle and mitosis
  • A microscope (if available) with onion root tip slides
  • Printed illustrations of cell cycle phases
  • Flashcards showing key vocabulary (interphase, prophase, metaphase, etc.)

Lesson Development – ABC Model

A – Anticipation (Warm-up / Starter)

Time: 5–10 mins
Ask: "How do we grow from a baby to an adult? What happens when you get a wound that heals?" Guide students to understand that cells divide and multiply for growth and repair.

 

B – Building Knowledge (Main Lesson Body)

Time: 25–30 mins

The Cell Cycle:

• A repeated process through which cells grow and divide. It includes:

1. Interphase – where the cell grows, carries out normal functions, and duplicates DNA.
2. M Phase (Mitosis) – where the cell divides into two identical daughter cells.

Mitosis (M Phase) Phases:

1. Prophase: Chromosomes condense and become visible; nuclear membrane disappears.
2. Metaphase: Chromosomes align at the cell’s equator.
3. Anaphase: Chromatids are pulled apart to opposite poles of the cell.
4. Telophase: Nuclear membrane re-forms, and cell prepares to split.
5. Cytokinesis: Cytoplasm divides, forming two identical daughter cells.

Importance of Mitosis:

• Growth
• Replacement of damaged cells
• Maintenance of chromosome number

Learners’ Activities (Expanded)

• Observe onion root tip cells under a microscope and identify the mitotic phases.
  • Draw each stage of mitosis and label them.
  • Match mitosis phase names with flashcard images.
  • Role-play mitosis using labeled signs and physical movement in groups.

 

Assessment Checks

• Oral Q&A to name stages of mitosis
  • Diagram labeling quiz
  • Brief written explanation: “Why is mitosis important?”

 

Notes (Expanded & Detailed)

The cell cycle includes the growth and preparation of a cell before it divides. The longest stage is interphase, where the cell copies DNA and gets ready for division. During mitosis, the copied genetic material is equally divided into two new cells. Mitosis ensures each new cell is identical and has the same number of chromosomes.

 

C – Consolidation (Conclusion & Assessment)

Time: 5–10 mins
Recap each phase and why it matters. Have learners explain what happens if mitosis goes wrong (e.g. cancer or growth defects).

 

Assignment (Expanded)

1. Create a comic strip of the stages of mitosis using labeled drawings.
2. Interview an elder: "Do our bodies always grow new cells? When might this stop or slow down?"
3. Watch a video about cell division and write 3 new facts you learned.

 

Differentiation / Inclusive Strategies

• Struggling Learners: Focus on labeling and visual aids
  • Advanced Learners: Compare mitosis to meiosis (preview for next lesson)
  • Students with Disabilities: Provide tactile diagrams or video-based lessons

 

Teacher’s Reflection (After Class)

• Did learners clearly understand the difference between mitosis phases?
• Which activities were most engaging?
• Plan: Next week will introduce meiosis and sexual reproduction.