Download Cell-Division

Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
CHAPTER 5 : CELL DIVISION
WORKSHEET 5.1 Chromosomes and Chromosomal Number
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1. Complete the graphic organizer given.
Organisms
types
Reproductive
cells
________________
_
characteristic
are formed through
mitosis
Have two sets of
chromosomes i.e.
_____________(2n)
___________
characteristic
in
Reproductive
organs
Have ________ _________of
chromosomes i.e. haploid (___)
[5 marks]
2. What is a CHROMOSOME?
a. The nucleus of a cell contains ___________________
b. Each chromosome consists of a long _______________ molecule which carry
genes.
c. The number of chromosomes or the ____________ _______________ of a certain
species is constant but varied from one species to another.
d. In humans, the nucleus in the somatic cell has ________ chromosomes (23 pairs or
2n). The gametes have a _______________ number of chromosomes i.e. 23
chromosomes.
[6 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
CHAPTER 5 : CELL DIVISION
WORKSHEET 5.2 : The Cell Cycle
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Complete the graphic organizer below:
The Cell Cycle
Growth phase 1

Synthesis of
___________ occur
G1 phase

Chromosomes
I
appear as
________________
T
G2 phase
DNA Synthesis phase

E
Replication of
___________
occurs

P
Duplicated
chromosomes
appear as
________________
Growth phase 2

The cell _________

The cell is
metabolically
________________
[10 marks]
S
E
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
Score __ /__
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CHAPTER 5: CELL DIVISION
WORKSHEET 5.3 : Mitosis
Complete the table below with suitable words.
Stage of
mitosis
Diagram
Explanation

The chromosomes ______________ and
become short and thick.

They consists of sister ____________ joined
together at the centromere.
METAPHASE

The spindle fibres begin to form.

The _____________ disappears

The nuclear membrane ____________

The centromeres of all chromosomes

line up on the _____________ ___________

The mitotic spindle is now fully formed

The two __________ __________ are still
attached to each other.

The two sister chromatids _____________

Each is pulled to the _____________ _____
by the shortening of the spindle fibres.

The two sets of chromosomes reach the
opposite poles of the cell
TELOPHASE

The chromosomes become less visible

They become ________________

The spindle fibres disappear

A new nuclear membrane forms around each
set of chromosomes
[15 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
CHAPTER 5: CELL DIVISION
Score __ /__
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WORKSHEET 5.4 : APPLICATION OF MITOSIS
1. The diagram below shows the sequence in the cloning process. Fill in the blanks with the
correct answers.
BLACK & WHITE
RABBIT
(somatic cell donor)
WHITE RABBIT
(Egg cell donor)
An unfertilized ____________
is taken from ovary
Somatic
cell (2n)
Diploid nucleus
is removed
___________ (n)
nucleus is
removed using
UV light
Egg cell without
a _________
_______ (2n) nucleus is
inserted into empty egg cell
Egg cell contains diploid
nucleus
Early embryo
New cloned
Embryo is
rabbit
____________ into
(genetically
surrogate mother
identical with
the
____________
rabbit)
[7 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
2. Fill in the blanks with the correct answers.
Tissue culture is the growth of tissues of living organisms in a suitable and sterile
_______________, containing nutrients and growth hormones.
[1 mark]
3. The figure below shows the in vitro tissue culture technique. Complete the flow chart
below.
A small piece of tissue that is root or ____________, is taken from the carrot
The ____________ is placed onto the culture medium
Plant cells divide by _________ to form a callus
Cells in the _________ develop into embryos and later into plantlets
Plantlets are then transferred to the _______ and grow into adult plants.
[ 5 marks ]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
4. Complete the graphic organizer regarding the advantanges and disadvantanges of
cloning below.
Cloning
Disadvantages
Advantages

Produce a ______number

_________________
of genetically identical
young plants in a short


All clones have the same
time.
level of ________ towards
Cloned plants and
certain diseases.
animals give better and

increased _________ for
example, better and more

Clones do not show any
prevent the process of
_____________

If the ___________
fruits, milk and meat.
environment changes, then
Cloning prevents
the clones will not survive
endangered species from
___________
[ 7 marks ]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
Score __ /__
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CHAPTER 5: CELL DIVISION
WORKSHEET 5.5: THE IMPORTANCE OF MEIOSIS
Fill in the blanks with the correct answers.
1. The importance of meiosis
a. Meiosis is a process of nuclear division to reduce the number of ____________ in
the new cells to half the number of chromosomes of the _________________ cells.
b. Each gamete contains the ______________ number of chromosomes (n).
c. During fertilization, two gametes will fuse together to form a ________________
zygote (2n). Thus, the diploid chromosomal number in organisms can be
____________________.
[5 marks]
2. Complete the diagram below about the human life cycle.
Haploid ______
Gamete formation
through ____________
_______ sperm
Fusion of gamete through
__________________
ovary
________
_
_______ zygote
(2n = 46)
Multicellular
diploid adults
(2n = ________)
Development and growth
through _____________
[8 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
Score __ /__
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CHAPTER 5: CELL DIVISION
WORKSHEET 5.6 : THE STAGES OF MEIOSIS
For question 1, fill in the blanks with the correct answers.
3. The stages in Meiosis
PLANTS
Occurs in

MEIOSIS
Anthers which produce
___________
stages

In an _____________ to
produce the egg
cell/ovum
MEIOSIS II
MEIOSIS I
_____________
ANIMALS
followed by
Metaphase I

_____________
Anaphase II
_____________
_____________
In the _____________ to
produce sperms

In the ovary to produce
________________
_
[10 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
4. Meiosis - Draw the diagrams and complete the table below.
Diagram
STAGES
Explanation
DIAGRAM
EXPLANATION

The chromosomes begin to condense and
become ________and _________

The ____________chromosomes come
together to form bivalents through a
process called ______________

Each homologous chromosome is made up of
two sister _____________
PROPHASE I

Exchange of segments of DNA occur between
non-sister chromatids in a process
called ________________

The points at which segments of chromatids
cross over are called ___________

At the end of this stage, the nucleolus and the
nuclear ___________disappear.

The two pairs of centrioles migrate to the
opposite pole of the cell which then act
as central points from which the ___________
______________ appear.

The chromosomes are lined up side by side as
tetrads on the metaphase _________

___________
The _________________ does not divide
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________

The _______________ chromosomes
separate and are pulled away by the spindle
ANAPHASE I
fibres to the opposite poles of the cell.

Although the cell started with 4
chromosomes, only _________
chromosomes move towards each pole.

The chromosomes arrive at the
_____________
TELOPHASE I

Each daughter nucleus now has a
___________ number of chromosomes
( only one set of chromosomes/ no more
homologous chromosomes )

The spindle fibres disappear.The
___________
____________ reappears to
surround each set of chromosomes, followed
by the ____________ process.
CYTOKINESIS takes place

The nuclear membranes of the daughter cells
disintegrate again
PROPHASE II

The spindle fibres reform

The chromosomes (each still made up of sister
chromatids) line up at the metaphase plate
METAPHASE II

Each sister chromatid is attached to the
spindle fibres at the centromere.
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________

The centromeres of sister chromatids separate
to form individual chromosomes
ANAPHASE II

The chromosomes move towards the opposite
poles of the cells
TELOPHASE II

The nucleoli and nuclear membranes reform.

The spindle fibres break down

Cytokinesis occurs

Four haploid daughter cells are formed.
[25 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
Score __ /__
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CHAPTER 5: CELL DIVISION
WORKSHEET 5.7: COMPARING MITOSIS AND MEIOSIS
1. Compare Meiosis I with Meiosis II.
Meiosis I
Meiosis II
Similarities
a. During prophase, the chromosomes become condensed and ______________
b. In metaphase, the chromosomes align at the __________________________
c. The number of chromosomes in daughter cells is _____________________
Differences
During prophase I, ____________
No crossing over occurs during
_____________ occurs.
_________
During metaphase I, ________________
During metaphase II, ________________
chromosomes align at the metaphase
align at the metaphase plate
plate.
Separation of __________ ________to
Separation of _________ ________ to
the opposite poles during Anaphase I.
the opposite poles during Anaphase II.
Number of daughter cells produced are
Number of daughter cells produced are
______________
_________
[11 marks]
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
2. Distinguish between mitosis and meiosis.
Similarities
Mitosis
Meiosis
1.
_________________________________________
2.
_________________________________________
3.
_________________________________________
Differences
Mitosis
Meiosis
Aspect
Location of occurrence
Number of nuclear division
Synapsis of homologous
chromosomes
Crossing over
Number of daughter cells
produced
Chromosomal number in
daughter cells
Genetic content in daughter
cells
Role
[19 marks]
Name : _____________________
Chapter 5 Cell Division
___________________________________________________________________________________________
CHAPTER 5: CELL DIVISION
WORKSHEET 5.8 CELL CYCLE – Summary
CELL CYCLE
Complete the concept map below [16 marks]
Stage
INTERPHASE
M phase
Stage
in
type
Meiosis
S phase
Score __ /__
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Stage
Stage
Prophase
Animal cell
Plant cell
Formation of
Formation of
plat cell
____________
___________
Anaphase I
followed by
Telophase II
Name : _____________________________
Chapter 5 Cell Division
________________________________________________________________________________________________________
Score __ /__
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CHAPTER 5: CELL DIVISION
WORKSHEET 5.9 Summary
Complete the following crossword puzzle.
1
2
3
4
5
7
6
8
12
11
9
10
13
14
15
16
[16 marks]
Name : _____________________________
Chapter 5 Cell Division
________________________________________________________________________________________________________
Clues for the crossword puzzle.
Across :
1. A membrane- bound structure within a cell which carries out a particular function.
4. A thread-like structure composed of chromatin and carries genes in a linear sequence which determines the
individual characteristics of an organism.
7. The green pigment found in all photosynthetic organisms such as green plants, algae and some bacteria.
9. The process of nuclear division which results in the formation of two genetically identical daughter nuclei.
10. The stage at which the sister chromatids are pulled apart to the opposite poles of the cell during mitosis.
14. The solution that fills the vacuoles of plant cells. It contains sugars, amino acids and waste materials.
15. The process of nuclear division that reduces the number of chromosomes in daughter cells to half that of the parent cell.
16. Cytoplasmic division is also known as ___________________
Down :
2.
A unit of inheritance composed of a sequence of nucleotides of DNA.
3.
A small dense round body within the nucleus of a non dividing eukaryotic cell that is the site of ribosome assembly.
5. The stage at which the chromosomes are arranged randomly at the metaphase plate during mitosis.
6.
Smooth endoplasmic reticulum.
8.
Membrane-bound sacs that contain hydrolytic enzymes which digest complex organic molecules.
11. Gametes contain only one set of unpaired chromosomes or a ______________ number of chromosomes (n).
12. Deoxyribonucleic acid.
13. During prophase of mitosis, each pair of centrioles acts as a central point from which the _________________ fibres
radiate.
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
CHAPTER 5 : CELL DIVISION (SUMMARY)
WORKSHEET 5.10 : Cell & Mitosis Crossword Puzzle
5.10/1
Name : _____________________________
Chapter 5 Cell Division
__________________________________________________________________________________________
CLUES: ACROSS
1. One member of a chromosome doublet.
6. Dark-staining body (composed of 2 chromatids) inside a cell during M-phase.
7. Chromosome number of sterile animals such as a mule.
9. Body part with definite physiological function (made up of more than one type of tissue).
10. Shrinkage of the cell contents (within cell membrane) due to water loss.
12. Prominent intracellular plant organelle that contains mostly water.
14. World's smallest flowering plant that produces the world's smallest fruit.
17. Phase of mitosis when conjoined sister chromatids separate from each other.
18. Number of haploid sets in a hexaploid cell.
20. Diameter of field of view in millimeters when using the 4X objective.
21. Purple, grape-like bodies inside cells of a potato tuber.
22. Phase of mitosis when chromosomes become visibly shortened and thickened.
23. Organelle site of cellular respiration and ATP production.
26. Number of haploid sets of chromosomes in a decaploid cell.
28. Aggregation of the same type of cells all performing a similar function.
29. Exactly 1000 of these metric units equals one millimeter.
30. Color of dye used to stain cheek epithelial cells in the Biology lab.
31. A female chicken (domestic fowl). [The opposite of a rooster.]
32. Acronym for Palomar Community College.
35. Movement of water molecules through a selectively-permeable cell membrane.
39. Phase of mitosis when chromosome doublets line up along the equatorial plate.
40. Primary molecular composition of chromatids--in addition to protein.
41. Site of synthesis of ribosomal RNA within the nucleus of a cell.
43. A haploid female reproductive cell.
44. Minute, membrane-bound structure in cytoplasm with a specific function.
CLUES: DOWN
1. Found in the cytoplasm of animal cells during M-phase (typically in pairs).
2. Approximately 25 of these metric units makes one inch.
3. Stain used to test for the presence of starch molecules.
4. How many cubical grains of ordinary table salt (NaCl) equals one millimeter?
5. Number of Barr bodies inside the cheek cell of a human male.
6. Photosynthetic organelle inside plant cells.
8. Cell with two sets of chromosomes.
11. Mitosis actually refers to the division of this organelle into duplicates.
13. Region where 2 chromatids of a chromosome doublet are attached.
14. Plant cell structure composed of cellulose and lignin.
15. Radiating protein strands at poles of an animal cell during M-phase.
16. Number of sets of chromosomes in a diploid cell.
19. Phase of cell cycle when the organelles and chromosomes replicate.
20. Number of cells in field of view with 4X objective (each cell is 0.8 mm).
24. Number of Barr bodies inside cheek cell of male with Klinefelter's Syndrome.
25. Movement of water molecules into porous material causing swelling.
27. Number of haploid sets of chromosomes in a nonaploid cell.
28. Phase of plant mitosis when the cell plate forms.
29. One set of chromosomes from the mother.
32. One set of chromosomes from the father.
33. Intracellular (intravacuolar) plant structure composed of calcium oxalate.
34. Cell with only one set of chromosomes.
36. Season of the year when smallest, most dense oak wood cells are produced.
37. Season of the year when largest stem (xylem) cells of an oak are produced.
38. Protein strands that attach to the centromere region during M-phase of cell cycle.
42. Smallest subunit of a living system--containing cytoplasm and organelles.