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A) A fancy dish served at Asian Fusion restaurants. B) The name of the newest singing sensation. C) The process by which haploid cells called gametes.

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Presentation on theme: "A) A fancy dish served at Asian Fusion restaurants. B) The name of the newest singing sensation. C) The process by which haploid cells called gametes."— Presentation transcript:

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2 A) A fancy dish served at Asian Fusion restaurants. B) The name of the newest singing sensation. C) The process by which haploid cells called gametes are formed.

3 Why is meiosis important? A) Just because it is. B) It allows the chromosome number to be halved. C) Yo no se!

4 What is involved in meiosis? A) A series of steps similar to mitosis. B) Haploid cells (gametes). C) A lot of vowels. D) Both A and B are correct.

5 What is a haploid cell? A) A cell that is happy. B) A sex cellegg or sperm. C) A cell that has half the number of chromosomes as a somatic (body) cell. D) Both B and C are correct.

6 Meiosis: The Facts Process resulting in formation of reproductive cells. Occurs using similar steps as mitosis. End product is 4 genetically different haploid cells. Haploid cells are 1C. Diploid cells are 2C. Occurs in two stagesMeiosis I and Meiosis II. Meiosis I – separates the tetrad resulting in TWO cells. Meiosis II – separates the sister chromatids resulting FOUR cells.

7 Meiosis – The Cast Homologous Chromosomes – (AKA Tetrad ) pairs of similar but not identical chromosomes. They code for the same characteristic. One is inherited from mother (pink) and other from father (blue).

8 Homologous Shoes? Look at your shoes. How can they compare to homologous chromosomes ? Sisters Similar but not identical (left and right shoes) All shoes (in class) No two pairs are identical Unique pairs of chromosomes in the cells

9 Meosis – The Cast Chromatin – packed genetic material From oodle noodle to bow pasta!

10 Meiosis – The Cast Sister Chromatids = one complete chromosome 1) Chromatid 2) Centromere 3) Short-Arm of chromatid 4) Long-Arm of chromatid

11 Meiosis – The Cast Tetrad –formed during meiosis I. These are PAIR of sister chromatids. Called a tetrad because there are FOUR chromatids present. Swapping of genetic material between chromosomes occurs between tetrad.

12 A Tetrad of Shoes Two pairs of shoes = one tetrad Each pair of shoes = one chromosome. Each pair = sister chromatids Each individual shoe = one chromatid.

13 Meiosis -- Preview Occurs in two stages. Steps are very similar to mitosis. 4 haploid cells are end product of meiosis II. Meiosis I and Meiosis II are similar. Exceptions: DNA replication Does NOT occur in Meiosis II. TWO cells produced after Meiosis I and FOUR cells after Meiosis II.

14 From Diploid to Haploid Meiosis I – results in TWO cells b/c TETRAD has been separated. Genetic information is swapped between maternal and paternal chromatids. This is called synapse.

15 From Diploid to Haploid Meiosis II – results in FOUR cells b/c sister chromatids have been separated. New cell are genetically different due to cross over.

16 MeiosisParty Time! SQUARE DANCING!!

17 Turkey in the CELL SQUARE DANCE MOVES/TERMS Link arms – represents the centromere Synapse – bump hips crossing over Mosey – a cross between a skip and a gallop Metaphase plate – the equator of the cell (it is the middle of the room) Salute – wave and bow

18 Meiosis I – The Nitty Gritty Prophase I – chromatin condense into chromosomes, tetrads form, spindles form Metaphase I -- tetrads line up at the equator, spindles attach to centromere Anaphase I – tetrads are pulled apart toward the poles by spindle fibers Telophase I – cell splits completely producing two daughter cells with one complete chromosome ( sister chromatids )

19 Meiosis II – The Scoop Meiosis II – Repeats the steps as Meiosis I with HALF as many chromosomes Prophase II – DNA does NOT replicate. Metaphase II– Sister Chromatids line up at the equator. Anaphase II – Sister chromatids are pulled toward the poles and separate. Telophase II – Cell splits 4 haploid cells are formed, with 1 chromatid.

20 Meiosis – Cover Shot

21 Questions, Pictures, Autographs?

22 Thank You!! Yall come back now! I hope you enjoyed the show and learned something.

23 Bibliography Beyonce Homologous Chromosomes Chromatin igure1.jpg igure1.jpg Chromatid mosomes.ssvg/220px-Chromosome.sv mosomes.ssvg/220px-Chromosome.sv Tetrad Meiosis Phases I/AAAAAAACs/epEwg1sD.jpghttp://1.bp.blogspot.com/-bRrXTfFkHTE/S1zINGEyw- I/AAAAAAACs/epEwg1sD.jpg Meiosis vs Mitosis life/meiosis-and-mitosis-cell-division.jpeghttp://image.wistatutor.com/content/fundamental-unit- life/meiosis-and-mitosis-cell-division.jpeg Meiosis Stain Waving Hands


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