Saturday 21st December 2024
Pearson BTEC Level 3 National Extended Diploma in
Applied Science
Shaafee uddin
Student id: 20527763
Unit 11: Genetics & Genetic Engineering
Learning Aim (B): Explore how the process of cell division in eukaryotic
cells contribute to cell division.
Cell division
Scenario:
I am a trainee lab technician supporting the Histology Department in a medical
laboratory. As part of my introduction, I have been asked to demonstrate how to set up a
microscope, prepare microscope slides to observe and draw the stages of mitosis and
meiosis.
I must prepare a report which includes evidence of my practical work, and discuss and
explain the structure, function, behaviour of the chromosomes during cell division and
evaluate how this leads to variation.
Introduction
What is cell division?
Cell division is the natural biological process by which a single cell divides to produce
new daughter cells. It plays a critical role in all living organisms, as it is essential for
growth, repair, and reproduction. This process ensures the renewal of damaged cells, the
production of new cells from older ones, and the maintenance of the total number of
chromosomes in an organism. There are two main types of cell
division: mitosis and meiosis.
In mitosis, body cells divide to produce two identical daughter cells, each receiving
genetic material identical to that of the parent cell and to each other. These daughter
cells are diploid, meaning they have the same number of chromosomes as the original
parent cell, (See figure 1.01). Meiosis, on the other hand, occurs in specific cells of the
ovaries and testes, producing four non-identical haploid daughter cells such as ova
or spermatozoa, (See figure 1.02) . Each haploid cell contains half the genetic material
of the parent cell. Due to certain events during meiosis, the resulting haploid sex cells
are genetically different from each other and from the parent cell. During sexual
reproduction, the fusion of two unrelated haploid cells at fertilization further contributes
to genetic variation.
, Figure 1.01- Diagram of
mitosis showing identical
diploid daughter cells.
Figure 1.02- Diagram of
meiosis showing non
identical haploid cells,
introducing genetic
The Importance of Cell Division
, There are many important functions served by cell division, (See figure 1.03). It is
crucial for growth, repair, and the maintenance of proper function in an organism. In
multicellular organisms, it helps form tissues and organs, ensuring that the body
continues to develop and heal when necessary. Cell division also allows for the
reproduction of organisms and the generation of genetic diversity, which is essential for
evolution. For plants, cell division through mitosis aids in the formation of new structures
and repairs damaged parts, contributing to their overall growth and survival.
Figure 1.03- Importance of cell
division in living organisms
Structure & function of human
Chromosomes
Overview of human chromosomes
Human chromosomes are linear, thread-like structures located in the nucleus of
cells, (See figure 1.04). They carry genetic information in the form of DNA, which is
tightly coiled around proteins called histones to form chromatin. This organisation
ensures efficient storage of genetic material while allowing it to fit inside the nucleus and
remain accessible for gene expression. The structure of chromosomes is crucial for their
function: during cell division, chromatin condenses into visible chromosomes to ensure
accurate DNA replication and distribution to daughter cells. Outside of division, the
relaxed chromatin structure allows genes to be accessed for transcription, ensuring
proper cellular function. The arrangement of genes along the chromosomes and the
regulation of their expression are essential for maintaining an organism's development,
heredity, and survival.
Pearson BTEC Level 3 National Extended Diploma in
Applied Science
Shaafee uddin
Student id: 20527763
Unit 11: Genetics & Genetic Engineering
Learning Aim (B): Explore how the process of cell division in eukaryotic
cells contribute to cell division.
Cell division
Scenario:
I am a trainee lab technician supporting the Histology Department in a medical
laboratory. As part of my introduction, I have been asked to demonstrate how to set up a
microscope, prepare microscope slides to observe and draw the stages of mitosis and
meiosis.
I must prepare a report which includes evidence of my practical work, and discuss and
explain the structure, function, behaviour of the chromosomes during cell division and
evaluate how this leads to variation.
Introduction
What is cell division?
Cell division is the natural biological process by which a single cell divides to produce
new daughter cells. It plays a critical role in all living organisms, as it is essential for
growth, repair, and reproduction. This process ensures the renewal of damaged cells, the
production of new cells from older ones, and the maintenance of the total number of
chromosomes in an organism. There are two main types of cell
division: mitosis and meiosis.
In mitosis, body cells divide to produce two identical daughter cells, each receiving
genetic material identical to that of the parent cell and to each other. These daughter
cells are diploid, meaning they have the same number of chromosomes as the original
parent cell, (See figure 1.01). Meiosis, on the other hand, occurs in specific cells of the
ovaries and testes, producing four non-identical haploid daughter cells such as ova
or spermatozoa, (See figure 1.02) . Each haploid cell contains half the genetic material
of the parent cell. Due to certain events during meiosis, the resulting haploid sex cells
are genetically different from each other and from the parent cell. During sexual
reproduction, the fusion of two unrelated haploid cells at fertilization further contributes
to genetic variation.
, Figure 1.01- Diagram of
mitosis showing identical
diploid daughter cells.
Figure 1.02- Diagram of
meiosis showing non
identical haploid cells,
introducing genetic
The Importance of Cell Division
, There are many important functions served by cell division, (See figure 1.03). It is
crucial for growth, repair, and the maintenance of proper function in an organism. In
multicellular organisms, it helps form tissues and organs, ensuring that the body
continues to develop and heal when necessary. Cell division also allows for the
reproduction of organisms and the generation of genetic diversity, which is essential for
evolution. For plants, cell division through mitosis aids in the formation of new structures
and repairs damaged parts, contributing to their overall growth and survival.
Figure 1.03- Importance of cell
division in living organisms
Structure & function of human
Chromosomes
Overview of human chromosomes
Human chromosomes are linear, thread-like structures located in the nucleus of
cells, (See figure 1.04). They carry genetic information in the form of DNA, which is
tightly coiled around proteins called histones to form chromatin. This organisation
ensures efficient storage of genetic material while allowing it to fit inside the nucleus and
remain accessible for gene expression. The structure of chromosomes is crucial for their
function: during cell division, chromatin condenses into visible chromosomes to ensure
accurate DNA replication and distribution to daughter cells. Outside of division, the
relaxed chromatin structure allows genes to be accessed for transcription, ensuring
proper cellular function. The arrangement of genes along the chromosomes and the
regulation of their expression are essential for maintaining an organism's development,
heredity, and survival.
