Download Text and cd/web guide for meiosis

SC135 Introductory Biology
Laurie Freeman
Name: ________________________
Lab Section: ____________
TEXT AND WEB GUIDE FOR TOPIC:
MEIOSIS
Refer to Key words on page 202 while you work through this exercise. You may omit the
following words: adult stem cell, blastocyst, cell plate, centrosome, crossing over, embryonic
stem cell, G0 phase, genetic recombination, inner cell mass, karyotype, kinetochore, morula,
multipotent, pluripotent, totipotent.
Read pages -192 (up to Meiosis I reduces the chromosome number).
1) Define meiosis.
2) What kind of cells result from the process of meiosis?
3) What is a very important difference between these cells and the parent cell?
4) Why is meiosis necessary
5) Where does meiosis take place in your body?
6) Draw a cell that is homozygous for the gene A.
7) Draw what the products of meiosis for this cell might look like (don't worry about how
they get that way yet... we'll consider the process further below).
8) What do you call the products of meiosis that happens in females? in males?
9) What happens to these cells when a new individual is formed?
10) Explain what we mean by a zygote.
11) Draw a zygote that is heterozygous for the gene E.
SC135 Introductory Biology
Laurie Freeman
12) Now draw an egg and a sperm that could have formed this zygote during fertilization.
13) Now try drawing a zygote that is homozygous for gene A and heterozygous for gene E.
14) Draw a possible egg and sperm that would lead to this zygote.
Now lets see how this process occurs! Meiosis is a process of 2 divisions: Meiosis I and
Meiosis II.
On the web - Review Unit 2, Chapter 9 Animation: Tutorial: Meiosis. This will familiarize
you with the stages of meoisis.
Read about Meiosis I on pg 192-194.
Meiosis I has the same four phases as mitosis.
15) What are these phases?
a. –
b. –
c. –
d. –
SC135 Introductory Biology
Laurie Freeman
16) What are bivalents?
17) When do bivalents form?
18) What happens to bivalents during meiosis I?
19) Are the daughter cells of meiosis I haploid or diploid? How do you know this?
Read about Meiosis II on pg 194.
Meiosis II has the same four phases as mitosis.
20) What are these phases?
a. –
b. –
c. –
d. –
21) Do bivalents form in meiosis II? Why?
22) Which is more like mitosis, meiosis I or meiosis II? Why do you say that?
23) Of the one that is most different, name 2 important ways that it differs.
a. –
b. –
Now review web activity: Unit 2, chapter 9, Animation 9.3: Activity: the stages of meiosis.
You can also review the animations: Meiosis.