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Campus: Princeton High School Author(s): Jody Gerber and Rachella Fannin Date Created / Revised: August 1, 2014 Six Weeks Period: 4th Grade Level & Course: Biology Timeline: 8 days Unit Title: Unit 8.1: Genetics and Heredity – Organism Reproduction Stated Objectives: TEK # and SE Lesson # 1 B.6 Science concepts. The student knows the mechanisms of genetics, including the role of nucleic acids and the principles of Mendelian Genetics. The student is expected to: B.6G Recognize the significance of meiosis to sexual reproduction (supporting standard) See Instructional Focus Document (IFD) for TEK Specificity Key Understandings Meiosis produces gametes that maintain the chromosomal number of a species. Sexual reproduction increases biodiversity. Misconceptions Students may think that only animals reproduce sexually, or confuse sexual reproduction with “having sex”. Point out that flowers reproduce sexually (have both sperm and egg cells). Many students confuse mitosis and meiosis and the significance of each type of cell division. Point out that mitosis produces somatic cell while meiosis produces gametes. Many students confuse meiosis I and meiosis II, and the significance of meiosis I is reducing the number of chromosomes to half. Point out that Meiosis I reduces the number of chromosomes to half of the original chromosome number. Some students don’t understand the role that meiosis plays in heredity (e.g. why offspring resemble their parents and why there are genetic differences between siblings. Some students are confused by somatic cell and gametes and the number of chromosomes in each cell. Some students have confusion over haploid and diploid. Key Vocabulary See vocabulary words for each day. Understanding vocabulary is imperative for students if they are going to pass STAAR. Use these words repeatedly. Suggested Day 5E Model Instructional Procedures (Engage, Explore, Explain, Extend/Elaborate, Evaluate) Materials, Resources, Notes, and Vocabulary Day 1 Topic: Significance of Asexual and Sexual Reproduction Engage Explain ENGAGE – use probe to investigate student’s basic understanding of asexual and sexual reproduction. Have students work in groups of 2-4 (preferably 2) Have students state the criteria used to classify organisms are asexual or sexual (or both). Materials Copy probe and notes for students Prepare PPT to present to students EXPLAIN – Use PPT and notes to compare and contrast asexual and sexual reproduction. Resources – 277278,608, 819-8120 Notes Stress the importance of understanding and using correct terminology. Vocabulary Words Asexual Reproduction Sexual Reproduction Gamete Haploid Diploid Chromosome number Chromosome Centromere Homologous Chromosomes Fertilization Genetic Diversity Ova/ovum (egg) Sperm Germ cell Day 2 Topic: Meiosis and Crossing Over Explain Explore Explain – Use PPT and notes to explain the steps of meiosis Explore – Use pop beads to explore the steps of meiosis and crossing-over. Materials Copy notes for students Pop beads Resources – page 323325 Notes Have students work in groups of 2 Pop beads (red and yellow). Diploid number = 2 Haploid number = 1 Vocabulary Words Meiosis Meiosis I Meiosis II Crossing over Homologous Chromosomes Genetic diversity Independent assortment Segregation Spermatogenesis Oogenesis Day 3 – Topic: Meiosis and Crossing-over (continued) Explore Elaborate Explore – Use card sort (pictures and labels) to correctly order the stages of meiosis. Materials Copies of card sort Resources Elaborate – Complete meiosis worksheet (homework) Notes Vocabulary Words Meiosis Meiosis I Meiosis II Crossing over Homologous Chromosomes Genetic diversity Independent assortment Segregation Spermatogenesis Oogenesis Day 4 – Topic: Meiosis (Computer Lab Activity) Explore Elaborate Explore – Snurfle Computer lab (awesome activity) Have students ONLY complete the meiosis portion Materials Copy worksheet that goes along with the game for each student Elaborate – study for quiz over meiosis (homework) Website for tutorials: http://bio.rutgers.edu/~gb101/lab10_meiosis/meiosis_web/index10. html Resources– page 323325 www.biomanbio.com Click on Genetics and Meiosis o Click on Snurfle Meiosis and Genetic o Students should only complete the meiosis portion of the activity. o Notes Schedule Computer lab Vocabulary Words See date 1 vocabulary words Day 5 Topic: Compare and Contrast Mitosis and Meiosis Explore Explore Use T-Chart to compare and contrast mitosis and meiosis Materials Copy worksheet Resources– page 326327 Notes – this is not a part of TEKS and if you need more time you could eliminate this activity Vocabulary Words See date 1 vocabulary words Day 6 Topic: Karyotyping Explain Explore Explain Use PPT and notes to explain karyotyping Explore Students use simulation to complete karyotyping Materials Copy karyotyping notes Resources– page 392393 Notes Schedule Computer lab If you need more time complete karyotyping on the next day. Vocabulary Words Karyotype (ing) Autosomes Sex Chromosomes Day 6 Evaluation Review Evaluation Review for Test o Asexual reproduction o Sexual Reproduction o Meiosis and Crossing-over o Karyotyping Materials Copy review Resources Notes Vocabulary Words Day 7 – Topic: Meiosis Evaluate Evaluate –Meiosis Materials Copy quiz for each student Resources Notes Test should be about 20 M/C questions Make modified version for SPED/504 Contact CMC Vocabulary Words Accommodations for Special Populations Accommodations for instruction will be provided as stated on each student’s (IEP) Individual Education Plan for special education, 504, at risk, and ESL/Bilingual.