This document contains a weekly home learning plan for grade 8 students. It includes the following: - A schedule for Monday with science lessons on cell division from 8:00-10:00 AM to be delivered through modules/activity sheets. - Contact information for 4 teachers available for questions from Monday to Friday and their office hours. - A reminder for parents to pick up and return student modules/outputs while following COVID protocols. - The plan will be implemented over a week and portfolios of student work will be submitted at the end.

1. Day and
Time
Learning Area Learning
Competency
Learning Tasks Mode of Delivery
7:00-7:30 Have a Short Exercise.
7:30-8:00 Preparations before attending classes.
Monday
8:00-10:00
Science 8  Compare mitosis and
meiosis, and theirrole in
the cell-division cycles-
S8LT-IVd-16
 Explain the significance of
meiosis in maintaining the
chromosome number-
S8LT-IVe-17
Last week, you learned how the body changes food into a usableform by means
of a group of organs referred to as the digestive system that gives energy to
the cells in our body. In this module, will explore more about cells, compare
mitosis and meiosis, and theirrole in the cell-division cycles and explain the
significance of meiosis in maintaining the chromosome number.
Quarter 4 Week 2:
Lesson 1: The Cell Cycle and Cell Division
DAY 1
INTRODUCTION (PANIMULA)
Pre-test
A. Enumeration
Direction: Enumerate the concepts asked. Write your answers in a separate
sheet of paper.
Give the two types of cell division:
1.
2.
Give the four stages of mitosis:
1.
2.
3.
4.
Learning Task 1:
Basic Cell Parts
DIRECTIONS: Draw and label the parts of the animal cell.
Identify the parts from the words present in the box below. Write your answers
in a separate sheet of paper.
Kukunin at ibabalik ng
magulang ang mga
Modules/Activity
Sheets/Outputs sa itinalagang
Learning Kiosk/Hub para sa
kanilang anak.
PAALAALA: Mahigpit na
ipinatutupad ang pagsusuot ng
facemask/face shield sa
pagkuha at pagbabalik ng mga
Modules/Activity
Sheets/Outputs sa mga
paaralan.
-Pagsubaybay sa progreso ng
mga mag-aaral sa bawat
gawain sa pamamagitan ng
text, call fb, at internet.
-Oras na maaaring makipag-
ugnayan sa mga guro: Lunes-
Biyernes
Numero ng Guro:
 Mellisa Ramos
09654018554
M-9:00 AM-12:00 N
T-8:00 AM -1:00 PM
WEEKLY HOME
LEARNING PLAN
School EASTERN BACOOR NATIONAL HIGH SCHOOL Grade Level Grade 8
Teachers Mellisa D.R. Ramos
Cielo Ivene Jalayjay
Joy Sanchez
Sophia Belinda B. Enejosa
Week 2
Date April 18-22, 2022 Quarter Fourth

2. DEVELOPMENT (PAGPAPAUNLAD)
Learning Task 2:
The Structure of the Chromosome and Its Location in the Cell.
DIRECTIONS: Study the pictures of chromosomes below and answer the
questions that follow. Write your answers in a separate sheet of paper.
F-1:00 PM -4:00 PM
 Cielo Ivene Jalayjay
09684993683
T-F- 3:00 PM-4:00 PM
 Joy Sanchez
09957390887
T and Th-1:00 PM-3:00 PM
F-9:00 PM -11:00 AM
 Sophia Belinda B. Enejosa
09352983250
M,W,TH-F
1:00 PM-4:00 PM
-ilagay ang pangalan at section
sa unang bahagi ng text
kasunod ang inyong
katanungan.
-ugaliing magtext o makipag-
usap ng may pagalang.

3. Guide Questions:
1.What are chromosomes? ____________________________
2. Where are the chromosomes located in the cell?___________
3. The short arm of the chromosome is referred to as _________.
4. The long arm of the chromosome is referred to as _________.
5. The point of attachment of the two sister chromatids is called
________________.
WHAT I NEED TO KNOW
The Chromosome
All living things contain what we call the genetic material that serves as the set
of instructions that direct the activities and functions of the cells. These genetic
materials, also known as the deoxyribonucleic acid or DNA, are passed on from
one generation to the next to ensure the continuity of life. In eukaryotic cells
(cells with organelles), the DNA are bound with proteins (histones) and are
organized as beads on strings to form chromosomes. The number of
chromosomes in a cell is characteristic of the species to which it belongs. For

4. example, humans have 46 chromosomes while rice have 12.
The Cell Cycle
The chromosomes of a cell change form as the cell transitions from one stage
to another in a typical cell cycle. The cell cycle may be divided into two stages:
the interphase where the chromosomes are long and extended and are also
referred to as chromatin, and the cell division phase where the chromosomes
become condensed or thickened.
The interphase refers to the period that follows one cell division and precedes
another. This stage is divided into three substages. The first gap period or G1,
during which time the cell grows initially. The middle stage is called the
synthesis stage or S1 is the period of DNA synthesis or replication where
chromosomes are duplicated. The second gap period or G2 represents a period
of rapid cell growth to prepare for cell division.
Cell Division
Alternating with the interphase is the cell division phase. In eukaryotic cells,
there are two types of cell division: mitosis and meiosis.
1. Mitosis

5. This type of cell division occurs in somatic or body cells which produces two
identical cells with the same number of chromosomes. Mitosis is divided into
four stages as shown in the diagram below:
Figure 6: Stages of Mitosis Illustrated by: Anziel Corsame
Prophase
The first and longest phase of mitosis is prophase. During prophase, chromatin
condenses into chromosomes or double stranded sister chromatids, and the
nuclear envelope, or membrane, breaks down. In animal cells, the centrioles
near the nucleus begin to separate and move to opposite poles (sides) of the
cell. As the centrioles move, a spindle starts to form between them.
Metaphase
During metaphase, spindle fibers attach to the centromere of each pair of sister
chromatids. The sister chromatids line up at the equator, or center, of the cell.
This is also known as the metaphase plate. The spindle fibers ensure that sister
chromatids will separate and go to different daughter cells when the cell
divides.
Anaphase
During anaphase, sister chromatids separate, and the centromeres divide. The
sister chromatids are pulled apart by the shortening of the spindle fibers. This
is likereeling in a fish by shortening thefishing line. One sister chromatid moves
to one pole of the cell, and the other sister chromatid moves to the opposite
pole. At the end of anaphase, each pole of the cell has a complete set of
chromosomes.
Telophase

6. During telophase, the chromosomes begin to uncoil and form chromatin. This
prepares the genetic material for directing the metabolic activities of the new
cells. The spindle also breaks down, and new nuclear membranes (nuclear
envelope) form eventually dividing the cytoplasm to form two daughter cells in
the process called cytokinesis.
2. Meiosis
Meiosis is a special type of cell division where a sex cell (egg cell or sperm cell)
or gamete undergoes two rounds of cell division to produce four daughter cells
(meiosis I and meiosis II), each with half the chromosomenumber as the original
parent cell with a unique set of genetic materials as a result of exchange of
chromosome segments.
Meiosis I is consist of four stages:
Prophase I
The chromosomes in this phase begin to pair off as homologous or exact pair.
The chromosome contract due to repeated coiling. Crossing-over takes place
during this stage when a segment of a sister chromatid of one chromosomeis
exchanged with the same segment of the sister chromatid of the homologous
chromosomethrough the formation of a cross-linkage of segments during the
process of crossing over as shown in the diagram below.
After crossing-over, the sister chromatids of each chromosomemay no longer
be identical with each other based on the genetic material they contain.
Metaphase I

7. The paired chromosomes arranged themselves in the equatorial plate.
Meiosis I is consist of four stages:
Prophase I
The chromosomes in this phase begin to pair off as homologous or exact pair.
The chromosome contract due to repeated coiling. Crossing-over takes place
during this stage when a segment of a sister chromatid of one chromosomeis
exchanged with the same segment of the sister chromatid of the homologous
chromosomethrough the formation of a cross-linkage of segments during the
process of crossing over as shown in the diagram below.
Anaphase I
Spindle fibers form and attach to the centromeres of the chromosomes. The
homologous chromosomes separate from each other completely and start their
movement towards the poles of the cells as they are pulled by the spindle fibers.
As the centromere of each chromosome does not divide, the sister chromatids
remain together.
Telophase I
This is the stage when the chromosomes reach their respective poles.
Cytokinesis follows and two daughter cells are formed. Each cell now has half
the chromosomenumber because only one chromosomefrom each pair goes
to the daughter cell. This is called the haploid condition, in contrast to the
diploid condition at the beginning of meiosis I where each chromosomepair is
intact. Telophase is followed by interphase II. Note that each chromosome still
has two sister chromatids; it is therefore necessary for the cells to undergo
another round of cell division. The second meiotic division, also known as
meiosis II, is mitotic in nature and consist of the following stages: prophase II,
metaphase II, anaphase II and telophase II; these stages are identical with
mitotic stages. The results are four cells, two from each daughter cell from
meiosis I, with one half the diploid chromosome number and with only one
sister chromatid for each chromosome.
DAY 2
Lesson 2: How meiosis maintain chromosome number in organisms
Pre-test
MULTIPLE CHOICE
Directions: Choose the letter of the correct answer. Write your answers
in a separate sheet of paper.
1. What type of cells undergo meiosis?
A. body cells C. nerve cells
B. reproductive cells D. epidermal cells
2. Humans have 46 chromosomes, 23 of which comes from the father and
23 from the mother. The number of chromosomes of a human being is

8. said to be
A. haploid C. tripled
B. diploid D. quadrupled
3. Meiosis is a special type of cell division where the cell undergoes two
rounds of cell division to produce four daughter cells each with half the
chromosome number as the original parent cell. This condition of the
chromosome is
A. Diploid C. homologous
B. Haploid D. identical
4. The sperm cells and the egg cells are reproductive cells of animals
which are also known as
A. spores C. pollen
B. gametes D. ovum
5. Meiosis reduces the chromosome number in half forming gametes in
plants and animal in the process called
A. Photosynthesis C. Gametogenesis
B. Respiration D. Fertilization
WHAT I NEED TO KNOW
The Role of Meiosis in Gametogenesis
The number of chromosomes normally remains the same within the species. It
does not double or triple for every generation, This means that a different kind
of cell division must take place in an individual that reduces the number of
chromosomes into half. That is what we call as meiosis which takes place in
plants and animals whenever gametes or sex cells are formed through the
process called gametogenesis.
Gametes such as eggs and sperms unite during fertilization, forming a diploid
zygote. The zygote has one set of chromosomes from the male parent and
another set from the female parent. In humans, both father and mother
contribute 23 chromosomes each through their gametes. Thus, the zygote has
46 chromosomes. Thezygote divides many times which produces a new diploid
multicellular organism.
Sperm cells are produced in the testes of male animals. Meiosis produces four
cells which are very small but of similar size. This cell becomes spermatozoa
(singular form is spermatozoon) or sperms. The nucleus is found in the head of
the sperm, mitochondria are found at the midpiece that connects the head to

9. the tail. These mitochondria provide the energy for the movement of the
sperm’s tail.
In female animals, egg cells are produced in the ovary. When a cell in the ovary
undergoes meiosis, new cells which differ in size are produced. After meiosis I,
two types of cells- one big and one small are produced. The big cell becomes
the egg and the small cells disintegrate. The egg cell contains a lot of stored
food which is used by the growing embryo at the start of its development. In
fertilization, the tiny sperm cell only contributes its genetic material found in
the head.
Thediagram below shows how gametogenesis in animals occurs in the testis of
a maleand in theovary of a female. Four sperm cells are produced during sperm
cell formation as compared to only one egg cell produced in This explains why
there are more sperm cells than egg cells in the reproductive system of males
and females respectively.
Figure 9: Gametogenesis in the testes and ovary of animals
Meiosis may not always proceed normally. Accidents sometimes happen.
These accidents may affect the functioning of the spindle fibers or the
movement of one or more chromosomes. In humans, someaccidents may have
known to cause abnormal conditions like Down’s syndrome and Cri du chat
syndrome.
ENGAGEMENT (PAKIKIPAGPALIHAN)
Learning Task 3:
Direction: Complete the table below.

10. Learning Task 4:
Direction: Answer the following questions in your notebook.
1. What do you think will happen if the number of chromosomes during the
process of meiosis or gametogenesis is not reduced to half?
___________________________________________________________
2. Read from any biology book or from the internet about Down’s syndrome
and Cri du chat syndrome and describe each condition briefly.
___________________________________________________________
ASSIMILATION (PAGLALAPAT)
Multiple Choices
Directions: Choose the letter of the best answer. Write the chosen letter on a
separate sheet of paper.
1. Which of the following parts of the cell contains the chromosomes?
A. Cytoplasm C. Cell membrane
B. Mitochondrion D. Nucleus
2. Chromosomes are made up of ____________________.
A. RNA and protein C. protein only
B. DNA and protein D. DNA only
3. Why is there a need for DNA to replicate during the synthesis stage of the
interphase?
A. To make sure that the cell undergo cell division
B. To make sure that when cell divides each daughter cell
has an exact copy of the DNA.
C. To make sure that the number of chromosomes would
be exactly the same as in original cells.
D. To make sure that the cell grow rapidly.
4. What events take place when the cell undergo cytokinesis?

11. A. There is the growth of nucleus.
B. It is a period of replication.
C. There is division of the cytoplasm
D. There is the reappearance of the nuclear membrane.
5. The following characteristics below describe meiosis EXCEPT
A. There are four daughter cells produced.
B. The number of chromosomes in every daughter cell is
haploid.
C. The daughter cells are genetically identical with the
original cell.
D. The cell undergo two rounds of cell divisions.
6. One of these events does not take place during meiosis
A. One successive division without any DNA replication
B. Chiasmata formation and crossing over
C. Segregation of homologous chromosomes
D. Separation of sister chromatids
7. The meiotic division takes place in
A. Meristematic cells
B. Conductive cells
C. Reproductive cells
D. Vegetative cells
8. The reason for daughter cells to differ from parent cells in meiosis is;
A. Crossing-over C. Replication
B. Deletion D. Addition
9. Meiosis is a special type of cell division where the cell undergoes two rounds
of cell division to produce four daughter cells each with half the chromosome
number as the original parent cell. This condition of the chromosome is
A. Diploid C. Homologous
B. Haploid D. Identical
10. The sperm cells and the egg cells are reproductive cells of animals which
are also known as
A. spores B. gametes C. pollen D. ovum
- Do Summative Test #1
-
REMINDERS:
 ANG MGA WEEKLY TASK AY HINDI IPAPASA KADA RETRIEVAL,
ITO AY IIPUNIN AT GAGAWING PORTFOLIO NA IPAPASA SA

12. HULING LINGGO NG PASAHAN NG THIRD QUARTER. ANG MGA
IPAPASA LAMANG KADA RETRIEVAL AY PERFORMANCE TASKS
AT SUMMATIVE TESTS.
 UGALIING MAGBASA NG MGA UPDATES SA SCIENCE GC SA
MESSENGER.
REFLECTION
- Complete the statement with what you have learned about the Cell
Division. Write atleast 3 sentences for each open ended question.
I understand that:
_____________________________________________________________________
_____________________________________________________________________
I realized that:
___________________________________________________________________________________
_______________________________________________________
Friday
1:00-3:00 PM
 Pagkukumpleto at pagpapasa ng mga gawain at portfolio.
 Pagpapamigay ng mga module at WHLP
3:00 PM
onwards
FAMILY TIME
Submitted by: Submitted to:
SOPHIA BELINDA B. ENEJOSA SANTIAGO G. PARIS
Science 8 Teacher Master Teacher I
Noted by:
ALFREDO N. SARABUSAB
Principal II