CHAPTER 3
CELLULAR REPRODUCTION
SECTION 1: CELLULAR GROWTH
CELL SIZE – SURFACE ARE AND VOLUME
A cell cannot be too small. Why? Because it cannot contain organelles and needed molecules
A cell cannot be too large (big) Why? Because it could not move enough materials across the
membrane surface
A cell needs to be a perfect size and for this to happen CELL GROWTH AND DIVISION must be
coordinated.
THE CELL CYCLE
The cell cycle is when cells grow and divide
Why do cells grow and divide?
1. Growth
2. Cell repair
There are three stages of the cell cycle
1. Interphase
In this stage, the cell grows and the prepares for cell division. The DNA makes copies of itself (DNA
Replication)
Interphase is the longest stage of the cell cycle
Interphase is divided into three substages
Gap 1 – This is the stage where the cell grows and prepares itself for DNA synthesis.
S -Synthesis- This is the stage when the DNA makes a copy of itself
Gap 2 – This is the stage where the cell grows and prepares itself for cell division
2. Mitosis – Cell Division
What organelles are involved in cell division?
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The nucleus, where we find the chromosomes
Centrioles where the spindle fibres are made
Cell membrane
Mitosis is divided into FIVE stages
Stage 1: Prophase