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WARM-UP#7 1.What type of cell division is the diagram above? 2.What phase of cell division the arrow pointing to?

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Presentation on theme: "WARM-UP#7 1.What type of cell division is the diagram above? 2.What phase of cell division the arrow pointing to?"— Presentation transcript:

1 WARM-UP#7 1.What type of cell division is the diagram above? 2.What phase of cell division the arrow pointing to?

2 Characteristics of living things Living things are made up of cells Living things are made up of cells Unicellular – one celled organisms Unicellular – one celled organisms Multicellular – many celled organisms Multicellular – many celled organisms REMEMBER THE…

3 Characteristics of living things Living things reproduce to make offspring of the same species Living things reproduce to make offspring of the same species Sexual reproduction Asexual reproduction

4 Characteristics of living things Living things grow and develop Living things grow and develop

5 MEIOSIS MEIOSIS PROCESS OF REDUCTION DIVISION (CHOROMOSOME # IS CUT IN ½ BY SEPERATION OF HOMOLOGOUS CHROMOSOMES IN DIPLOID CELLS)

6 2.Chromosome number in body cells vs. gametes? Body Cells: Body Cells: Diploid (2N) - have 2 sets Gametes: Gametes: Haploid (N) - have 1 set

7 3.Summarize the events of meiosis. 3.Summarize the events of meiosis. (See also #5)

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9 4 haploid (N) cells 4 haploid (N) cells Genetically different from each other & the original cell Genetically different from each other & the original cell 4.What are the results of meiosis?

10 6.Differences between Mitosis & Meiosis? MITOSIS produces 2 identical diploid (2N) cells MITOSIS produces 2 identical diploid (2N) cells MEIOSIS produces 4 different haploid (N) cells MEIOSIS produces 4 different haploid (N) cells

11 Sperm Cell? Sperm Cell? 23 chromosomes 23 chromosomes Gamete is haploid (N) Gamete is haploid (N) Egg Cell? Egg Cell? 23 chromosomes 23 chromosomes Gamete is haploid (N) Gamete is haploid (N) White Blood Cell? White Blood Cell? 46 chromosomes 46 chromosomes Body cell is diploid (2N) Body cell is diploid (2N) 7.Human cells 2N=46. How many chromosomes are in a…?

12 The chromosomes assort independently, not individual genes The chromosomes assort independently, not individual genes 8.How does independent assortment apply to chromosomes?

13 Farther apart 2 genes are, more likely theyll be separated Farther apart 2 genes are, more likely theyll be separated Frequency of crossing-over = to distance between 2 genes Frequency of crossing-over = to distance between 2 genes 9.Crossing-over & gene mapping? library.thinkquest.org/ 19037/genome3.html

14 Very far apart from each other. Very far apart from each other. 10.How close are 2 usually independently assorted genes?

15 biology.clc.uc.edu/ courses/bio104/meiomito.htm biology.clc.uc.edu/ courses/bio104/meiomito.htm

16 MEIOSIS FOLDABLE

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