Chromosomes are found in the nucleus of eukaryotic cells. They are made up of DNA and proteins. During interphase, chromosomes appear as thin threads but condense further during cell division. After mitosis, the two daughter cells have the same number of chromosomes as the parent cell. After meiosis, the four daughter cells have half the number of chromosomes as the parent cell. Mitosis occurs in diploid cells while meiosis occurs in haploid cells.

5. Part of the body/Trait Appearance
Type of hair Straight
Wavy or kinky
hair
Earlobes Attached Unattached
Color of the
skin
Light or fair Dark
Hairline Straight
With widow’s
peak
Dimples With dimples
Without
dimples
Handedness
Right
handedness
Left
handedness
Nose High-bridged Low-bridged

8. How is the
number of
chromosomes
maintained?
How are
genes
organized?
How is a
chromosome
structurally
designed to
perform its
functions?

9. Grade 7 and 8 Biology

10. Where are the chromosomes
found in a eukaryotic cell?
Chromosomes are made up of
what substances?
How will you describe the structure
of a chromosome in cells at
interphase stage?
During cell division, what happens
to the structure of chromosomes?

11. After mitosis, the 2 daughter cells
contains how many chromosomes?
After meiosis, the 4 daughter cells
contains how many chromosomes?
The single-stranded chromosome will
become double-stranded during what
phase of cell division?

12. In what type of cells does mitosis
occur ?
DIPLOID [2N]
In what type of cells does meiosis
occur ?
HAPLOID [N]

14. Storage 1
Expression
of
Characters
2
Transmit
Information 3
Variation 4

16. “Cyto”
kinesis
Interphase
“Karyo”
kinesis

18. p arm
centromere
q arm
telomere
Sister chromatids

19. Is this chromosome threadlike or
rod-shaped?
Is this chromosome single-stranded
or double-stranded?
Where is the centromere of the
chromosome?

21. [1] Protein
[2] Nucleic Acid
HISTONE
Deoxyribonucleic
Acid

26. Complete the labels
for complementary
polynucleotide.

35. GENE?
[structure?]

36. [3000 base pairs]
[3.2 billion
Nitrogenous Base]

37. Gene
Production
of building
blocks
Production
of Melanin
Amylase
Synthesis of
Hemoglobin

38. Scientific breakthrough inspire
us to explore the possibilities
of finding applications that
can ultimately benefit people.
What are the practical
applications of
understanding chromosome
number and gene functions?
Science and
Technology 9,
Page 77-78