Transcript Mitosis vs. Meiosis - Kaneland School District

Mitosis vs. Meiosis
Stand and Say - Mitosis
1) Face your table partner
2) Each will take a turn talking for 30 seconds about what
they remember regarding Mitosis (what happens, why
does it happen, etc)
3) The listener MAY NOT TALK but should use non-verbal
communication to support the “talker”
4) Class discussion
5) Write one question on the post-it you have about cell
division and organisms reproduce and grow.
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
The numbers
• 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
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.
Videos explanations
Meiosis: Crossing Over and Variability [3D
Animation]
• https://www.youtube.com/watch?v=rqPMp0U0H
OA
Nova
• http://www.pbs.org/wgbh/nova/miracle/divi_flash.
html
Amoeba Sisters
• https://www.youtube.com/watch?v=toWK0fIyFlY