1. Meiosis
Chapter 10, Section 2

2. Meiosis Activity You need one purple book for every two students.
You will be answering questions with your partner. Both of you need to write the answers in on a separate paper using FULL SENTENCES.
You need to be prepared to share your answers with the class!

3. Turn to page 52
Read the section titled Meoisis: Sex, Heredity, and survival with your partner and answer the questions. Remember, you may be called on to answer the questions!
What is a zygote? How many chromosomes does a zygote have?
2. What would happen if an egg and a sperm each had a full 23 pairs of chromosomes?

4. Turn to page 54
With your partner, discuss the model titled: Phases of Meiosis. Make sure you READ the captions. Please answer the questions.
There are limitations to models. Why does it show 3 pairs of chromosomes for humans instead of 23?
Describe what happens between prophase I and Metaphase I (Prometaphase I)

5. Turn to page 54
With your partner, discuss the model titled: Phases of Meiosis. Make sure you READ the captions. Please answer the questions.
During meiosis, how many times are the chromosomes copied?
How many times does the cell divide?

6. Turn to page 54
With your partner, discuss the model titled: Phases of Meiosis. Make sure you READ the captions. Please answer the questions.
At the end of the First Meiotic Division (Meiosis I) how many cells are there?
At the end of the Second Meiotic Division (Meiosis II) how many cells are there?
How does this compare to Mitosis?

7. Turn to page 54 What do we call the four cells at the end of meiosis?
With your partner, discuss the model titled: Phases of Meiosis. Make sure you READ the captions. Please answer the questions.
What do we call the four cells at the end of meiosis?
In a human, how many chromosomes will these cells have? Do they have sister chromatids?
Are these cells called haploid or diploid cells?

8. Read “Errors in Aging Eggs” at the bottom of pg 54.
When do men start and stop producing sperm (gametes)?
Describe how female egg production is different than male sperm production.
What is the effect of having “old eggs”?

9. Turn to pg 56
Compare and contrast mitosis and meiosis using a Venn diagram:

10. Turn to pg 58 and read “Why You’re Not Just Like Your Relatives”
Explain the ‘Dance Analogy’ and what it means for meiosis:
How many different way are there for the dancers/chromosomes to line up?
Describe what ‘crossing over’ means:
Why is it important that different people have a wide variety of genes?