Meiosis 2C or not 2C

Meiosis2C or not 2CWhat is meiosis?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.

Why is meiosis important?A) Just because it is.

B) It allows the chromosome number to be halved.

C) Yo no se!What is involved in meiosis?A series of steps similar to mitosis.

B) Haploid cells (gametes).

A lot of vowels.

Both A and B are correct.What is a haploid cell?A cell that is happy.

A sex cellegg or sperm.

A cell that has half the number of chromosomes as a somatic (body) cell.

Both B and C are correct.Meiosis: The FactsProcess 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.

Meiosis The CastHomologous 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).

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

Meosis The CastChromatin packed genetic material

From oodle noodle to bow pasta!

Meiosis The CastSister Chromatids = one complete chromosome ChromatidCentromereShort-Arm of chromatidLong-Arm of chromatid

Meiosis The CastTetrad 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.

A Tetrad of ShoesTwo pairs of shoes = one tetrad

Each pair of shoes = one chromosome.

Each pair = sister chromatids

Each individual shoe = one chromatid.

Meiosis -- PreviewOccurs 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.From Diploid to HaploidMeiosis I results in TWO cells b/c TETRAD has been separated.

Genetic information is swapped between maternal and paternal chromatids. This is called synapse.

From Diploid to HaploidMeiosis II results in FOUR cells b/c sister chromatids have been separated. New cell are genetically different due to cross over.MeiosisParty Time!SQUARE DANCING!! Turkey in the CELLSQUARE DANCE MOVES/TERMS

Link arms represents the centromereSynapse bump hips crossing overMosey a cross between a skip and a gallopMetaphase plate the equator of the cell (it is the middle of the room)Salute wave and bow

Meiosis I The Nitty GrittyProphase I chromatin condense into chromosomes, tetrads form, spindles formMetaphase I -- tetrads line up at the equator, spindles attach to centromereAnaphase I tetrads are pulled apart toward the poles by spindle fibersTelophase I cell splits completely producing two daughter cells with one complete chromosome (sister chromatids) Meiosis II The ScoopMeiosis II Repeats the steps as Meiosis I with HALF as many chromosomes Prophase II DNA does NOT replicate.Metaphase IISister 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. Meiosis Cover Shot

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BibliographyBeyonce http://www.zimbio.com/picture/lihk6AfVkBL/Beyonce+KnowlesHomologous Chromosomes http://www.kdimages.com/discover/previews/916/90011467.JPGChromatin http://www.micro.magnet.fsu.edu/cells/nucleus/images/chromatinstructuresfigure1.jpgChromatid http://www.wpcontent.answcdn.com/wikipedia/commons/thumb/0/0b/chromosomes.ssvg/220px-Chromosome.svTetrad http://www.synapses.co.uk/genetics/meiosis.htmlMeiosis Phases http://1.bp.blogspot.com/-bRrXTfFkHTE/S1zINGEyw-I/AAAAAAACs/epEwg1sD.jpgMeiosis vs Mitosis http://image.wistatutor.com/content/fundamental-unit-life/meiosis-and-mitosis-cell-division.jpegMeiosis Stain www.brown.edu/Courses/BIoo32/gentherp/meiosis.jpgWaving Hands http://1.thumbs.canstock.com/canstock0046569.jpg