The Cell Cycle Flashcards
The cell cycle describes
The life cycle of a cell obviously
What is the cell cycle meant?
The cell cycle is the changes that occur in
a cell during the period between one cell
division and the next.
Cell cycle is divided into two parts :
INTERPHASE
CELL DIVISION
Interphase is
When cell is not dividing.
Cell Division
Mitosis or meiosis.
INTERPHASE
The longest phase in the cell cycle.
is an active phase because
New organelles are formed
Single stranded chromosomes from double stranded copies of themselves.
MITOSIS means: ONE
A nucleus divides into TWO in order to from TWO nuclei.
MITOSIS means: TWO
Each nuclei becomes enclosed in a cell.
( daughter cell )
MITOSIS means: THREE
The chromosome number in each stays the same as the parent nucleus.
MITOSIS means : FOUR
The genes are identical to each daughter cell and parent cell.
Mitosis is known as SOMATIC CELLS because :
Mitosis takes place in cells that are not associated with reproductive system.
Please explain what Mitosis is :
Mitosis is a form of cell division.
It is how ONE parent nucleus will give
RISE to TWO daughter that share the
same DNA making them identical.
MITOSIS PROCESS
STAGE ONE
Double stranded chromosomes start to become visible in the nucleus.
Fibres appear.
The nuclear membrane starts to break down.
MITOSIS PROCESS
STAGE TWO
The nuclear membrane breaks down now.
Chromosomes line up in the middle.
The fibres begin to ATTACH to each chromosome.
MITOSIS PROCESS
STAGE THREE
the fibres contract
two fibres then attach
one strand from each double stranded chromosome is pulled.
MITOSIS PROCESS
STAGE FOUR
chromsomes elongate within each nucleus and becomes chromatin.
a nuclear membrane forms around.
The functions of Mitosis
Unicellular organisms
It allows single celled organisms to
reproduce asexually like plants and
bacteria.
The functions of Mitosis
Multi Cellular Organisms
It allows growth and repair of cells.
Formation of new cells to replace old and damaged cells.
The functions of Miosis :
To halve the number of chromosomes so that the normal number can be restored
Produce chromosomes with genetic variations
MEIOSIS is a
Form of nuclear division in which four
daughter nuclei contain half the
chromosome number of the parent
nucleus.
Immediately after MEIOSIS
The daughter nueclei are enclosed by cells.
When meiosis takes place in a diploid cell
All daughter cells will be
All daughter cells will be haploid.
Haploid cells are able to
Fuse with another gamete of opposite sex.
Where does Meiosis occur and what do they produce?
In the ovaries and testes
They produce gametes called eggs and sperm.
