Mitosis vs. Meiosis
Mitosis
Meiosis
Meiosis
Based on the diagram,
The difference between mitosis and meiosis is
that mitosis produces two identical daughter
cells and meiosis produces four genetically
different daughter cells
Mitosis
Parent cell
Diploid (2n)
Meiosis
Parent cell
Diploid (2n)
1st division
Diploid (2n)
Daughter cell
Diploid (2n)
1st division
Diploid (2n)
2nd division
Daughter cell
Haploid (n)
2nd division
Daughter cell
Haploid (n)
2nd division
Daughter cell
Haploid (n)
2nd division
Daughter cell
Haploid (n)
Daughter cell
Diploid (2n)
The numbers
• The cells created from mitosis are diploid or 2n.
• The cells created from meiosis are haploid or n
Definitions:
• Diploid (2n) – two of each type of chromosome
(in homologous pair – carry the same trait)
• Haploid (n) – one of each type of chromosome
Let’s try it…
• Human cells have 46 chromosomes.
• Therefore, the diploid number (2n) of
chromosomes in humans is 46.
• The haploid number (n) of chromosomes in
humans is 23.
The reason why: mitosis
• To replace other cells that have been
damaged or worn out
• To allow multicellular organisms to grow
• For asexual reproduction
• Because they get too big!
The reason why: meiosis
• Meiosis results in four cells with half the
number of chromosomes so that when the
sex cells (sperm and egg) combine, the
original or normal number of chromosomes
will be restored
One last thing… [the] where?
• Mitosis occurs in normal body cells (i.e.
skin cells), and meiosis occurs in sex cells
(i.e. sperm and egg) only.
The verdict
• Lets see mitosis and meiosis in action!