grade 9 - chromosomal basis of inheritance

Part of the body/Trait Appearance

Type of hair StraightWavy or kinky

hair

Earlobes Attached Unattached

Color of the

skinLight or fair Dark

Hairline StraightWith widow’s

peak

Dimples With dimplesWithout

dimples

HandednessRight

handedness

Left

handedness

Nose High-bridged Low-bridged

How is the number of

chromosomes

maintained?

How are genes

organized?

How is a chromosome structurally designed to perform its functions?

Grade 7 and 8 Biology

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?

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?

In what type of cells does mitosis

occur ?DIPLOID [2N]

In what type of cells does meiosis

occur ?HAPLOID [N]

Storage 1

Expression of

Characters2

Transmit Information 3

Variation 4

“Cyto”kinesis

Interphase

“Karyo”kinesis

p arm

centromere

q arm

telomere

Sister chromatids

Is this chromosome threadlike or rod-shaped?

Is this chromosome single-strandedor double-stranded?

Where is the centromere of the chromosome?

[1] Protein[2] Nucleic Acid

HISTONE

Deoxyribonucleic

Acid

Complete the labels for complementary polynucleotide.

GENE?[structure?]

[3000 base pairs][3.2 billion

Nitrogenous Base]

Gene

Production of building

blocks

Production of Melanin

Amylase

Synthesis of Hemoglobin

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