Starter Feb. 24, 2010 Copy & Answer

INSTRUCTIONS FOR FOLDABLE 1ST PAGE CELL CYCLE INTERPHASE MITOSIS CYTOKINESIS LABEL ALL PAGES 1-8 2ND PAGE INTERPHASE DRAW LABEL AND COLOR PHASE FROM PAGE 267

INSTRUCTIONS FOR FOLDABLE 3RD PAGE TITLE IS MITOSIS PROPHASE METAPHASE ANAPHASE TELOPHASE PAGES 4-7 DRAW LABEL AND COLOR THE FOUR PHASES PAGE 207 PAGE 8 DESCRIBE CYTOKINESIS FOR PLANT AND ANIMAL CELLS DRAW LABEL AND COLOR

Meiosis A type of cell division

Background Vocabulary Haploid: a cell with one set of chromosomes Diploid: a cell with two sets of chromosomes Gamete: sex cell Somatic cell: body cell Egg: female sex cell Sperm: male sex cell

More Background Somatic cells are diploid cells Gametes are haploid cells In humans, diploid cells have 46 chromosomes In humans, haploid cells have 23 chromosomes

Meiosis Purpose: to make egg and sperm cells Starts with one diploid somatic cell Ends with four haploid gametes Meiosis makes sexual reproduction possible Sexual Reproduction: the production and fusion of haploid gametes

Overall Process of Sexual Reproduction Man Woman Meiosis Sperm Egg Fertilization Zygote

Process of Meiosis Before meiosis can begin, DNA replication has to occur. Meiosis has two divisions, each with four steps (total of 8 steps) After chromosomes are replicated, homologous chromosomes pair up

Meiosis (cont.) Homologous chromosomes line up in the center of the cell, then separate. The cells split almost completely into two cells In each of the two cells, sister chromatids stay paired Sister chromatids line up in the center, then separate.

Meiosis (cont) The two cells divide to become four cells One chromosome from each pair goes into each cell

Results of Meiosis Ends with four gametes Gametes are genetically different Allows chromosome number to remain constant in species

Vocabulary Squares for Vocabulary Page 263 Section 10. 2 Meiosis Vocabulary Squares for Vocabulary Page 263 Section 10.2 Meiosis. Each vocabulary square should include word, definition, diagram/drawing, and sentence using the word. 4 drawings Divide paper into 4 equal squares for drawings. Draw, Label, and color the following: Homologous Chromosome (p.265), Sexual Reproduction (p.266), Crossing Over (p. 269 A,B,C), and Non-disjunction (p.271) White Paper Rulers Color Pencils on Cart. *Read pages 263-273 Section 10.2 Meiosis

MITOSIS CELL DIVISION DRAWINGS and VOCABULARY Definitions Page 201 ALL 17 TERMS DRAW, LABEL, AND COLOR: Fig. 8.10 Page 205 Chromosome Only Fig. 8.11 Page 206 Fig. 8.13 Page 207 A, B, C, and D Read pages 201-210 Homework: Write vocabulary words and definitions 2 times each; Review notes