MITOSIS VS. MEIOSIS

What observations do you see? Record them on your notes sheet.

Mitosis 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

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, SO….

• The diploid number (2n) of chromosomes in humans is 46

(MITOSIS).

• The haploid number (n) of chromosomes in humans is 23

(MEIOSIS).

The reason why: Mitosis• To replace or repair 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 when…

• the sex cells (sperm and egg) combine, the original or normal number of chromosomes will be restored

• REMEMBER – EACH PARENT C AN ONLY CONTRIBUTE HALF THE GENETIC INFORMATION

One last thing… [the] where?

• Mitosis occurs in normal body cells (i.e. skin cells, blood

cells, nerve cells, etc…)

• Meiosis occurs ONLY in sex cells (i.e. sperm and egg)

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Amoeba Sisters - Mitosis

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Amoeba Sisters – Meiosis