Warm Up 9/29: Complete the Mitosis Matching Worksheet 2) Order the stages of Mitosis in order using the image cards. 3) When you have the order correct, paste them on a separate piece of paper OR on the back of the Mitosis Matching Worksheet

What is synapsis? Synapsis: Pairing of homologous chromosomes

What is a tetrad? Tetrad: two pairs of homologous chromosomes next to each other

Warm Up 10/5 – Meiosis Sequence Cards Sequence meiosis image cards in the correct order. Before taping images down – think about where you would label the following terms: -Interphase -Prophase I -Metaphase I -Anaphase I -Telophase I -Cytokinesis -Prophase II -Metaphase II -Anaphase II -Telophase II -Crossing Over -1N Haploid -Independent Assortment -2N Diploid

Independent Assortment http://highered.mheducation.com/sites/9834092339/student_view0/chapter11/random_orientation_of_chromosomes_during_meiosis.html

http://campus. udayton http://campus.udayton.edu/~INSS/Dillon230/LECTHELP-2/2spermatogenesis_vs.htm

Meiosis Animation: http://highered.mheducation.com/sites/0072495855/student_view0/chapter28/animation__how_meiosis_works.html

Classwork 9/29: Diagram all the stages of meiosis to show the formation of four haploid cells. (Can use Page 164 & 165 in textbook)

Check in: How does meiosis contribute to genetic variation? Crossing over during Prophase I ONLY Independent Assortment (Random Orientation of Bivalents) during Metaphase I ONLY

Classwork 10/5: SL & HL: Complete Meiosis vs. Mitosis Packet Read about “Karyograms” (Page 157 – 158) Complete DBW on Page 159 HL Only: 4) Read 11.4 Sexual Reproduction Pages 499 – 504 (Spermatogenesis vs. Oogenesis) 5) Take notes on how/when sperm & eggs are formed (You can use notes on the next two slides from BioNinja)

These cells (spermatogonia) then undergo a period of growth 11.4.2  Outline the processes involved in spermatogenesis within the testes, including mitosis, cell growth, the two divisions of meiosis and cell differentiation Spermatogenesis describes the production of spermatozoa (sperm) in the seminiferous tubules of the testes The first stage of sperm production requires the division of germline epithelium by mitosis These cells (spermatogonia) then undergo a period of growth This is followed by two meiotic divisions that result in four haploid daughter cells These haploid cells then differentiate to form sperm cells The developing sperm cells are nourished throughout by the Sertoli cells

11.4.5  Outline the processes involved in oogenesis within the ovary, including mitosis, cell growth, the two divisions of meiosis, the unequal division of cytoplasm and the degeneration of polar body Oogenesis describes the production of female gametes (ova) within the ovary The process begins during foetal development, when a large number of cells (oogonia) are formed by mitosis before undergoing a period of growth These cells begin meiosis but are arrested in prophase I until puberty At puberty, some follicles continue to develop each month is response to FSH secretion These follicles complete the first meiotic division to form two cells of unequal size The cell with less cytoplasm is a polar body (which degenerates), while the larger cell forms a secondary oocyte The secondary oocyte begins the second meiotic division but is arrested in prophase II (until fertilisation) It is released from the ovary (ruptured follicle develops into corpus luteum) and, if fertilisation occurs, will complete meiosis The second meiotic division will produce an ovum and a second polar body