1. Warm up: Independent assortment fill in the blank Ensure a ________ separation of homologous ______________ during meiosis I. The random assortment of genes is essential for evolution Without random assortment an entire species could die out with based on one genetic flaw of or one faulty adaptation Genetic variation allows for adaptation Race horse Work horse Page 11 Tuesday January 19, 2015 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology Sickle cell anemia Genetic flawGenetic variation

2. Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology Learning scale: Student’s self-evaluation: Complete at home or at the end of class, use the 4-3-2-1 Learning scale (two to three sentences). Homework: Complete the graphic definition. 1234 Differentiate between mitosis and meiosis, sexual and asexual reproduction. Define spermatogenesis and oogenesis. List the steps to meiosis. Define sexual and asexual reproduction. Summarize the events the occur during meiosis. Differentiate between sexual and asexual reproduction and the correlation of genetic variation. Explain how genetic variation is a function of crossing-over and independent assortment during spermatogenesis and oogenesis. Evaluate the genetic and evolutionary advantages to sexual versus asexual reproduction. 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology Page 11 Tuesday January 19, 2015

3. Hand out and read through crossing over lab. Copy the questions on page 3 of the lab on to page 9 of your notebook. Answer these questions while completing the lab. Pages 1 and 2 of the lab will be pasted on page 10. To receive full credit: Have the teacher check chromosomes showing Prophase I with crossing over Metaphase I Telophase I Metaphase II Anaphase II End of meiosis II Page 9-10 Tuesday January 19, 2015 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology

4. Warm up: Random distribution of homologous chromosome is called “random assortment”. This means there is no way to determine which one chromosome from a homologous pair will end up and any one of the four gametes produced during meiosis. 4 Really know 3 Know 2 Know most 1 Know sort of 0 Don’t know Diploid cell Show all the possible gametes that can be produced using the cell on the right as an example. Assume there is NO crossing over. Reminder: the two larges “X”s are a set of homologous chromosomes, with a total of four chromatids, as are the small “X”s. Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology Page 12 Tuesday January 19, 2015 I

5. Warm up: Check your answer Question: “Show all the possible gametes that can be produced using the cell on the right as an example.” Diploid cell Haploid cell at the end of meiosis I: homologous chromosomes have separated There are four possible combinations of chromosomes at the end of meiosis I. or 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology I X x X xX x Page 12 Tuesday January 19, 2015

6. Haploid cells at the end of meiosis I: homologous chromosomes have separated There are four possible combinations of chromosomes at the end of meiosis I. or Haploid cells at the end of meiosis II: individual chromatids on the chromosomes have separated There are eight possible combinations of chromosomes at the end of meiosis II. or 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology X x X xX x I Page 12 Tuesday January 19, 2015

7. Review Crossing over: furthering the process of genetic variation Crossing over occurs in Prophase I Crossing over recombines the DNA in new and random ways. Crossing over, in conjunction with independent assortment, make for an almost infinite possible combination of genes. 4 Genetic variation and assortment Evolution and reproduction 3 Events of meiosis, variation and reproduction 2 Steps of meiosis basic definitions 1 Mitosis vs meiosis, sexual vs asexual Learning goal: Assess their understanding of meiosis, genetics, evolution and population ecology Page 12 Tuesday January 19, 2015