o Describe the process of meiosis, including independent assortment and crossing over. o Explain how reduction division results in the formation of haploid gametes or spores. o SC.912.L.16.17: Compare and contrast mitosis and meiosis and relate to the

o Describe the process of meiosis, including independent assortment and crossing over. o Explain how reduction division results in the formation of haploid gametes or spores. o SC.912.L.16.17: Compare and contrast mitosis and meiosis and relate to the processes of sexual and asexual reproduction and their consequences for genetic variation. (H) Think About It As geneticists in the early 1900s applied Mendel’s laws, they wondered where genes might be located. They expected genes to be carried on structures inside the cell, but which structures? What cellular processes could account for segregation and independent assortment, as Mendel had described? Watch Intro Video Clip: Remember to REVIEW these notes daily so you will be ready to participate in class discussion the next day. This practice of daily review will also prepare you for future assessments. Unit: Cell Cycle Chapter: 12 Topic: Cell Reproduction Section: 12.4 Meiosis Name: Daniel Adichirayil Class: Mr. Urbina Period/Seat #: Period 1 Date: October 17, 2020 Pre Post Scale General Rubric for Student Understanding 2 Points 4 I understand ........... enough to teach. (I can peer-tutor on this topic) (Expert Teacher - Wow!!) 3 I understand ............ enough to use. (Skilled & Independent!) 2 I understand part of ............, but not............. . (Need some help please!) 1 I do not have an understanding of................. . (S.O.S. - I’m lost; will come for tutoring.) This study source was downloaded by from CourseH on :10:53 GMT -05:00 Make it Personal 1. Do you think that either your MOM or DAD gave you more genetic information than the other? Or do you think that you inherited an equal amount of genetic information from each? Explain. Make Predictions I feel like I’ve inherited a relatively equal amount of genes from both my mom and dad. I look like both of them in distinct ways. 1. What is the record of one woman giving birth to children over her lifetime? In other words, what is the most amount of children a woman ever had? 2. How many viable egg cells (on average) do you think that a woman will produce in a lifetime? 3. How many viable sperm cells (on average) do you think that a man will produce in a lifetime? 4. What are the chances of ‘You being you’? 5. What do you think is the statistical probability of the union of the exact sperm cell and egg that created the zygote from which you originated? (In other words, what are the chances of you being born- statistically speaking?) 6. What biological process gives rise to such genetic diversity? 1. Follow link to find out: 2. Change highlight color for answer:  A human female typically has about 400,000 follicles/potential eggs, all formed before birth. Only several hundred (about 480) of these “eggs” will actually ever be released during her reproductive years. Normally, in humans, after the onset of puberty, due to the stimulation of follicular-stimulatinghormone (FSH) one “egg” per cycle matures and is released from its ovary. One month the left ovary will release a potential egg and the next month the right ovary will release a potential egg. 3. Change highlight color for answer:  The average male will produce roughly 525 billion sperm cells over a lifetime and shed at least one billion of them per month. 4. Click HERE for answer: 5. To find out the statistical probability of you being born follow link: 6. Move the box that is over the picture for the answer: Summary: Watch Fertilization Video This study source was downloaded by from CourseH on :10:53 GMT -05:00 Questions/Main Ideas: Notes: & Key Terms In My Own Words (“How will I remember each term?”) Include Images and Hyperlinks Key Questions How many sets of genes are found in most adult organisms? 2 What events occur during each stage of meiosis? Chromosomes line up, sister chromatids separate, & newly forming gametes are haploid, and each chromosome now has just one chromatid. How is meiosis different from mitosis? Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells. How can two alleles from different genes be inherited together? Alleles of different genes tend to be inherited together when those genes are on the same chromosome. Key Vocabulary (with video hyperlinks) Make Sure That YOU are using YOUR OWN words. DON’T COPY and PASTE Definitions. Homologous Similar in position, structure, and evolutionary origin but not in function. Diploid A cell/nucleus containing 2 complete chromosomes, one from each parent. Haploid A cell/nucleus having a single set of unpaired chromosomes. Meiosis Process that produces 4 daughter cells Tetrad A set of 4 Crossing-Over Homologous chromosomes exchanging genes, forming parental characteristics. Zygote A diploid cell resulting from the fusion of two haploid gametes Watch the following Video Clip(s) and use it to help you fill out the Key Vocabulary Above Crossing Over Take Notes Comparing Meiosis and Mitosis Compare and Contrast: Using the following animation, compare and contrast by filling out the table to show the differences between mitosis and meiosis. Mitosis Meiosis Unique Features of Meiosis Number of cells produced 2 4 Identical or unique daughter cells 2 4 Parent cell (Diploid or haploid) 0 0 This study source was downloaded by from CourseH on :10:53 GMT -05:00 Daughter cells (Diploid or haploid) 2 4 Building Vocabulary How will you remember the word mitosis and not confuse it with meiosis? Mitosis is for 2, meiosis is for 4 Making it Visual: Meiosis I During meiosis I, a diploid cell undergoes a series of events that results in the production of two daughter cells. Neither daughter cell has the same sets of chromosomes that the original diploid set had. How does crossing-over affect the alleles on a chromosome? Answer: Crossing over can put new alleles together in combination on the same chromosome, causing them to go into the same gamete. In your notebook Describe the difference between meiosis I and meiosis II. How are the end results different? Click here: Meiosis I Click Here: Meiosis II Homologous chromosomes separate. Sister chromatids separate. Create a chart that lists the important information about each phase of meiosis (You may use this video clip for a tutorial clip) Image of Stage Description of Stage Prophase I Homologous chromosomes condense and become visible as the x shape we know, pair up to form a tetrad, and exchange genetic material by crossing over