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Subject: Biology
Semester: 1
Period: 2
Week: 10
School Name:
Teacher’s Name:
Subject: Biology
Grade Level: Grade 12
Date: Week 10
Lesson Duration: 45 minutes
Week & Period: Week 10, Period II
Topic: Skeletal, Muscular and Reproductive Systems
Sub-topic: Menstrual Cycle, Fertilization, Conception and Cycles of Sexuality
Learning Objectives
By the end of this lesson, learners will be able to:
- Explain the stages of the menstrual cycle and the hormonal control involved.
- Describe the process of fertilization and conception.
- Understand the concept of sex determination.
- Explain the meaning and phases of cycles of sexuality.
Previous Knowledge
Learners are familiar with reproductive organs, sperm and egg cells, and the process of gamete formation.
Instructional Materials
- Chart showing stages of the menstrual cycle
- Diagrams of fertilization and zygote formation
- Hormone flashcards (FSH, LH, Estrogen, Progesterone)
- Poster illustrating the cycles of sexuality
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Prompt discussion with:
- “Why do females menstruate monthly?”
- “What happens when the sperm meets the egg?”
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
- Menstrual Cycle Overview (28-day cycle):
- Follicular phase: FSH stimulates egg development
- Ovulation: LH surge causes egg release
- Luteal phase: Corpus luteum forms; progesterone maintains lining
- Menstruation: If no fertilization occurs, lining sheds
- Hormonal Control:
- FSH – stimulates follicles
- LH – triggers ovulation
- Estrogen – builds uterine lining
- Progesterone – maintains uterine lining
- Fertilization and Conception:
- Fertilization occurs in the fallopian tube
- Sperm meets egg to form a zygote
- Zygote travels to uterus and implants
- Sex Determination:
- XX – Female
- XY – Male
- The sperm determines the baby's sex
- Cycles of Sexuality:
- Natural physical, emotional, and hormonal changes that occur across a person’s lifetime
- Begins at puberty and changes with age, environment, and experience
- Includes phases: puberty, reproductive years, menopause (females), and aging phase
Learners’ Activities (Expanded)
- Identify menstrual cycle stages using chart
- Participate in a hormone matching game
- Watch a short animated video (if available) on fertilization
- Roleplay hormone changes during menstrual cycle in groups
- Group discussion on sexuality across life stages
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Ask learners:
- “What is the function of progesterone?”
- “Where does fertilization occur?”
- “Who determines the sex of a baby?”
- “What happens in the luteal phase?”
Evaluation Methods
- Diagram labeling activity (menstrual cycle chart)
- Short answer quiz
- In-class oral quiz: “Explain ovulation in your own words”
- Group work: describe each phase of the cycle of sexuality
Short Notes (Expanded)
- The menstrual cycle prepares the female body for possible pregnancy.
- Fertilization is the union of sperm and egg, leading to conception.
- Sex determination depends on the sex chromosome carried by the sperm.
- Cycles of sexuality describe how sexual development and expression change over a lifetime.
Extra Instructions for Expanded Work
- Expanded Notes: Include annotated diagrams of the cycle, hormone table, and simplified charts of fertilization and implantation.
- Assignment:
- Draw and label the menstrual cycle showing hormonal changes.
- Write one paragraph explaining the importance of progesterone.
- Write two paragraphs explaining what the “cycle of sexuality” means and give examples.
- Optional Task: Interview a healthcare provider (or research) about common misconceptions about menstruation and fertility.
Differentiation / Inclusive Strategies
- Use visual aids for students who need image-based learning
- Offer sentence starters for writing assignments
- Group discussions help auditory learners
- Provide simplified versions of hormone charts for slow learners
Teacher Reflection
- Were students able to follow hormonal changes during the menstrual cycle?
- Did they understand how conception occurs?
- Should I revisit sex determination before moving into STIs and health in Week 11?