Unit 4: I Got It From My Momma
Intro to Meiosis
Name _______________________________________________
Date ________________ Period _______ Assignment 43
Notes
Flash Back!
What is the purpose of mitosis?
1. ___________________
2. ___________________
 Mitosis produces _______________________ that are _______________________ to the parent cell
 Only occurs in _______________________ (body cells)
Flash Forward!
What is the purpose of meiosis?
1. _____________________
2. _____________________
•
•
Specialized cell for sexual reproduction
In humans, these are the _____________ and _____________
Quick Check!
Remember! there are _______ main types of cells in our bodies
– ______________________: all body cells except gametes
– ______________________: sex cells (sperm & egg)
Mitosis vs. Meiosis
Meiosis is similar to mitosis in some ways

Both result in the __________________________

Both include multiple phases
– P______________________
– M______________________
– A______________________
– T______________________
Meiosis is different from mitosis in other ways

Meiosis includes ______________________, but
mitosis only includes ______________________

Meiosis produces in ___________________________
called _______________ and mitosis only produces
________________________ called _______________
*Vocab Master*
1. Haploid: _____________________________________________________________
• Only ___________ copy of each gene ___________
• ___________ chromosomes
• ___________
2. Diploid: _____________________________________________________________
• ___________ copies of each gene ___________
• ___________ chromosomes
• ___________
Mitosis begins with
________________________ cell
and produces
________________________ cells
Meiosis begins with
________________________ cells
and produces
________________________ cells
Diploid
Haploid
Animation
1. With respect to meiosis, when does DNA replication
occur?
A.
B.
C.
D.
Before meiosis I only
After meiosis I only
Before and after meiosis I
After meiosis II
A.
B.
C.
D.
Anaphase I
Metaphase I
Prophase I
Telophase I
2. When does crossing over take place in meiosis?
Summary
Practice
3. During which of the following phases of meiosis do
chromosomes line up at the equatorial plate?
A.
B.
C.
D.
Telophase I
Metaphase II
Anaphase I
Prophase I
A.
B.
C.
D.
Prophase I
Anaphase II
Telophase II
Metaphase
4. During which of the following phases of meiosis does
the nuclear membrane reform around the
chromosomes?
Description
Are daughter cells
identical to the
parent?
Number of cell
divisions?
Number of
daughter cells
produced?
Type of daughter
cells produced?
(somatic / gamete)
Type of daughter
cells produced?
(haploid / diploid)
Mitosis
Meiosis
Meiosis is the special type of cell division that produces gametes or egg and sperm cells in sexually reproducing organisms. In all
other somatic cells or cells found in the body, chromosomes are found in matching pairs. This is called the diploid state. Each pair
has one chromosome that came from the mother’s egg and one from the father’s sperm.
1. What does the prefix di- mean?
2. How are chromosome organized in diploid cells? What do these chromosome pairs look like?
In contrast, gametes contain only one chromosome. Gametes are not diploid, rather they are haploid. They contain only half the
number of chromosomes that other somatic cells have. When an egg and sperm come together in fertilization the zygote will have
matching pairs of chromosomes and become diploid.
3. How do the chromosomes of gametes differ from other somatic cells?
4. Since fertilization combines an egg and sperm to create a diploid zygote, why does it make sense that gametes only contain
half the chromosomes other body cells need?
In meiosis, as in mitosis, the number of chromosomes doubles at the beginning of the process. In mitosis, one cell division follows.
The two daughter cells that result are diploid. In meiosis, however, cell division occurs twice. This process results in four daughter
cells. Each daughter cell has haploid chromosomes.
5. How many times does the parent cell divide in mitosis?
6. What kinds of cells are produced after mitosis?
7. How many times does the cell divide during meiosis?
8. What kinds of cells are produced after meiosis?