LESSON EXEMPLAR

LEARNING COMPETENCY NO. 4

School TSF Grade Level 7

MATATAG K Name of Pre- Mark Edizon A. Learning Area Science
to 10 service Teacher Ornopia
Teaching Dates October 17, 2024 Quarter 2
10:15-11:15
and Time G7 Kalaw
Curriculum 1:00-2:00
G7 Bonifacio

I. CURRICULUM CONTENT, STANDARDS, AND LESSON COMPETENCIES

A. Content The learners should understand that meiosis is a type of cell division
Standards that reduces the chromosome number by half, producing four
genetically diverse haploid cells (gametes).
B. Performance By the end of the quarter, the learners are should be able to
Standards accurately describe each stage of meiosis (prophase, metaphase,
anaphase, telophase, cytokinesis) and differentiate between Meiosis I
and Meiosis II.
C. Learning 1. Describe the stages of meiosis.
Competencies 2. Explain the role of meiosis in sexual reproduction and;
3. Differentiate between mitosis and meiosis.
D. Learning At the end of the lesson, the learners will be able to:
Objectives 1. Understand the stages of meiosis.
2. Value the importance of meiosis in human reproduction
and;
3. Draw diagrams of meiosis stages.

II. CONTENT Meiosis

Integration  Tagalog
 English
III. LEARNING RESOURCES
A. References https://biologycorner.com/worksheets/meiosis2.html
https://byjus.com/biology/stages-of-meiosis/
B. Other Learning
Resources

IV. TEACHING AND LEARNING PROCEDURES

Before/Pre-Lesson Proper
Teacher’s Activities Student’s Activities
Preparatory A. Prayer
Activities Let us stand for a short prayer. Everyone Stand
Let us pray.
Dear God
Bless our time together today.
Grant us wisdom to understand,
patience to learn and kindness to

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 support one another. Guide our
thoughts and actions as we study and
grow.
Amen. Amen

B. Greetings
Good morning/afternoon class! Good morning/afternoon
C. Classroom Management Sir.
Before you take your seats, please
kindly pick up the pieces of paper (Students will take their
under you chair, and align your chairs seats.)
properly. You may now take your seats.
Secretary, is there an absentee today?
It’s great that no one is absent today. Nobody is absent today
sir!.
Activating Prior Before we proceed to new lesson let’s  The main stages of
Knowledge have a recap. the cell cycle are
interphase (which
1. What are the main stages of the includes G1, S, and
cell cycle? G2 phases) and the
2. What is the significance of the mitotic phase
G1 checkpoint in the cell cycle? (which includes
3. What happens during the S mitosis and
phase of interphase? cytokinesis).
 The G1 checkpoint
ensures that the
cell is ready for
DNA replication by
checking for
sufficient energy,
nutrients, and the
absence of DNA
damage before
progressing to the S
phase.
 During the S phase,
DNA replication
occurs, resulting in
the duplication of
chromosomes to
ensure that each
daughter cell will
receive a full set of
genetic material.
Lesson Help students comprehend the process
Purpose/Intention of meiosis, its phases, and its
importance in sexual reproduction.
Lesson Language Vocabulary Matching Answer Key:
Practice Directions: Match the following 1. A

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 meiosis-related terms with their correct 2. B
definitions: 3. C
4. E
1. Homologous chromosomes 5. F
2. Crossing over 6. G
3. Diploid 7. D
4. Haploid
5. Tetrad
6. Gamete
7. Independent assortment

Definitions:
a. A pair of chromosomes, one from
each parent, that are similar in shape,
size, and genetic content.
b. The process during which
homologous chromosomes exchange
genetic material during prophase I of
meiosis.
c. A cell containing two complete sets
of chromosomes, one from each parent.
d. The random distribution of
homologous chromosome pairs during
metaphase I, leading to genetic
variation.
e. A cell containing only one set of
chromosomes, such as a sperm or egg
cell.
f. A structure containing four
chromatids that forms during prophase
I of meiosis.
g. A reproductive cell (sperm or egg)
that is haploid.

During/Lesson Proper

Reading the Key Meiosis is a process where a single

Idea/Stem cell divides twice to produce four cells
containing half the original amount of
genetic information. These cells are the
gametes – sperms in males and egg in
females. The process of meiosis is
divided into 2 stages.

Meiosis I:

 Prophase I
 Metaphase I
 Anaphase I

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  Telophase I
 Cytokinesis I

Prophase I: The nuclear envelope

disintegrates. Chromosomes begin to
condense. Spindle fibers appear.
Metaphase I: The homologous
chromosomes align at the equatorial
plate ensuring genetic diversity among
offspring.
Anaphase I: The homologous
chromosomes are pulled towards the
opposite poles.
Telophase I: Spindle fibers disappear.
Nuclear envelope is reformed.
Cytokinesis I: The cytoplasm and the
cell division result in 2 non-identical
haploid daughter cells.

Meiosis II

 Prophase II
 Metaphase II
 Anaphase II
 Telophase II
 Cytokinesis II

Prophase II: The chromatin condenses

into chromosomes. Nuclear envelope
disintegrates. Centrosomes migrate to
either poles. Spindle fibers are
reformed.
Metaphase II: The chromosomes align
along the equatorial plate. On the
contrary, the chromosomes in
metaphase I were in homologous pairs.
Anaphase II: Sister chromatids are
pulled to the opposite poles.
Telophase II: Nuclear envelope
redevelops and the spindle fibers
disappear.
Cytokinesis II: The cytoplasm and cell
divide producing 4 non-identical haploid
daughter cells.
Developing To develop our understanding in I. Crossing over
Understanding of our discussion by answering these occurs in prophase I
the Key Idea/Stem questions: of meiosis, where
homologous
1. How does the process of crossing chromosomes

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 over during meiosis contribute to exchange segments
genetic diversity in organisms? of their genetic
2. Why is meiosis important for material. This
sexual reproduction? results in new
3. Explain why meiosis includes two combinations of
rounds of cell division while genes that are
mitosis only includes one. What different from either
is the significance of this parent, increasing
difference? genetic diversity in
offspring.
II. Meiosis is important
for sexual
reproduction
because it reduces
the chromosome
number by half,
ensuring that when
fertilization occurs,
the resulting
offspring has the
correct number of
chromosomes.
III. Meiosis has two
rounds of division to
reduce the
chromosome
number by half,
producing four
haploid cells. This is
necessary so that
when fertilization
occurs, the
chromosome
number is restored
to a diploid state in
the zygote. In
contrast, mitosis
only requires one
division to maintain
the same
chromosome
number in daughter
cells for growth and
repair.
Deepening Activity
Understanding of Direction: Identify the phases of
the Key Idea/Stem meiosis.

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After/Post-Lesson Proper
Making In what way does meiosis ensure that offspring have different
Generalizations genetic material than their parents?
and Abstractions
Answer: Meiosis ensures genetic differences by mixing genes
through crossing over and randomly sorting chromosomes
during the division process, resulting in gametes with unique
genetic combinations not identical to either parent.
Evaluating Formative Assessment
Learning Multiple Choice
Instructions: Choose the best answer for each question.

1. What is the primary function of meiosis?

a) To produce identical daughter cells for growth and repair.
b) To produce haploid gametes for sexual reproduction.
c) To create new cells for the immune system.
d) To replace worn-out cells in the body.
2. How many rounds of cell division occur during meiosis?
a) One
b) Two
c) Three
d) Four
3. What is the name of the process where homologous
chromosomes exchange genetic material?
a) Crossing over
b) Replication
c) Transcription
d) Translation
4. What is the result of meiosis I?
a) Two diploid daughter cells
b) Two haploid daughter cells
c) Four diploid daughter cells
d) Four haploid daughter cells
5. Which of the following is NOT a source of genetic variation in
meiosis?
a) Crossing over

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 b) Independent assortment
c) Random fertilization
d) DNA replication

Answer Key:
1. B
2. B
3. A
4. B
5. D
Additional Activities Assignment:
for Application or Research a genetic disorder that is caused by an error in meiosis.
Remediation (if And give 5 examples.
applicable)
Remarks Note observations on
Problems
any of the following Effective Practices
Encountered
areas:
strategies explored
materials used
learner
engagement/
interaction
others
Reflection Reflection guide or prompt can be on:
 principles behind the teaching
What principles and beliefs informed my lesson?
Why did I teach the lesson the way I did?
students
What roles did my students play in my lesson?
What did my students learn? How did they learn
ways forward
What could I have done differently?
What can I explore in the next lesson?

Prepared by: Reviewed: Approved:

MARK EDIZON A. MARILAG A. JORDAN CATHERINE N. GUERRER

ORNOPIA Cooperating Teacher Master Teacher I
Pre-Service Teacher
Noted

FLORIDA M. MAGABO
Head Teacher III, MathSci Dept.