Presenting…

Meiosis

Why is meiosis important?

• It makes sexual reproduction possible. P.324• Results in a new individual that has a unique

combination of genes.Pg. 613• Each parent gives exactly one-half of the chromosomes. • Making a full set of chromosomes for its species.

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Meiosisi = how i was created!

• Two nuclear divisions

• Produce or make:

1. Sex cells (sperm and egg)

2. The sex cells have half of the chromosomes of the parent cell -23

3. This happens to make cells for sexual reproduction (Oh my!)

• Sex Cell

• Sex Chromosome

• Egg or sperm

• Thread-like chromosome that carries the genes that determine the sex of the offspring.

• XX=girl• XY=boy

Meiosis Animation

• http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/page3.html

Comparison Mitosis and Meiosis

• Mitosis• (My toe, sis!)• Makes body cells.• New cells have the same

number of chromosomes as the original cell. IDENTICAL

• New cells are identical to the original cell

Meaning:• Skin cells make skin cells,

bone cells make bone cells, etc.

• Meiosis• (i was made this way!!)• Makes sex cells.• New cells have half of

the number of chromosomes as the original.

• No two sperm or egg cells are ever exactly alike.

• Offspring or babies will be

unique!