Presentation - mitosis and meiosis NEW 2023 DA.pptx
1. How do organisms make
more cells?
L.O to understand the two main ways in which more cells can be made
and the similarities and differences between the processes.
2. Important words
Haploid: This is
HALF the diploid
number – only sex
cells (gametes) are
haploid.
Diploid: The
TOTAL number of
chromosomes in
a body cell
3. Which cells are we
trying to make more
of?
Body cells
New cells must be genetically
identical to the original cell
(‘parent’ cell). Nucleus must
remain diploid.
Mitosis
Sex cells (gametes)
New cells must be genetically
different to the parent cell –
variation is important! Nucleus must
be haploid.
Meiosis
5. Mitosis: How?
In mitosis the original
(parent) cell divides
into two new
genetically identical
(daughter) cells.
Each new cell remains
diploid.
6. Mitosis: Key ideas for IGCSE
Makes new body cells
Important for growth, repair and asexual reproduction
Diploid number is maintained
Two daughter cells are produced and they are genetically
identical to the parent cell
8. Meiosis: How?
In meiosis, a parent cell
(the original cell)
divides into four
genetically different
daughter cells (new
cells).
Each new cell is
haploid.
9. Meiosis: Key ideas for IGCSE
Happens when gametes are made
Important for sexual reproduction
New cells are haploid
Four daughter cells are made and there is variation between
them
