Meiosis vs Mitosis Ms Blalock Ms Hartsell and

Meiosis vs. Mitosis Ms. Blalock, Ms. Hartsell and Mr. Luckman

Do Now How do the offspring compare to the parent cells in asexual reproduction versus sexual reproduction?

Today’s Agenda • AIM: Does the process of meiosis lead to more genetic variation than the process of mitosis? • At the end of this lesson, we will be able… – Explain the difference between mitosis and meiosis – Identify and explain the process that leads to genetic variation within a species – Describe the steps in gamete formation

Today’s Agenda • • 1. Do Now 2. INM and Activity 1: What is the difference? 3. Video: Mitosis vs. Meiosis 4. Check for Understanding 5. Activity 2: Genetic Variation 6. Check for Understanding 7. Activity 3: Asexual or sexual 8. Exit Ticket

INM: What is the difference? Mitosis Meiosis Type of Reproduction: Asexual Type of Reproduction: Sexual Number of parent cells: 1 Number of parent cells: 2 Offspring: Are identical to the parents Offspring: Contain ½ DNA from parent 1 and ½ DNA from parent 2

Activity 1: What is the difference? • Directions: Go to www. fordhamarts. com and select Unit 4: Reproduction. – Click on the tab labeled “Student PPT 4. 3” – Use the Power. Point to complete the guided notes for Activity 1

Check for Understanding 1. Asexual reproduction produces offspring that each contain A. genetic information from one parent B. genetic information from two parents C. less genetic information than either parent D. a unique combination of genetic information 2.

Think, Pair, Share • Do we as humans ever undergo mitosis? If so, when? If not, why? • Individually answer (1 minute) • In your pairs/groups (1 minute) • Whole class share out (2 minute)

Did you know? • A majority of the cells in our body undergo mitosis. – Example: skin cells • There are only a couple of cells that do not and these include your sex cells. • Sex cells undergo meiosis

Activity 2: Crossing over • Directions: Watch the video and answer the following questions on your guided notes http: //highered. mcgraw-hill. com/sites/9834092339/student_view 0/chapter 30/meiosis_with_crossing_over. html • 1. At what stage in meiosis does crossing over occur? • 2. Describe the process of crossing over in an illustration. How does this process relate to “genetic variation”? • 3. Using your knowledge of crossing over, how is it possible for a child to have their mother’s nose but their father’s eyes?

Crossing Over

Check for Understanding Which organism would most likely have new gene combinations? A. a frog that was produced from a skin cell of a frog B. a hamster resulting from sexual reproduction C. a bacterium resulting from asexual reproduction D. a starfish that grew from part of a starfish

Activity 3: Asexual or sexual? • Directions: Using the RUN strategy read through the two informational texts about sexual and asexual reproduction. • After reading, answering the following prompt below in your guided notes. – If you were an organism given the choice of either reproducing sexually or asexually, which would you choose?