Name: ______________________________
Date: _________________
Unit 5B Study Guide:
Complete the following table:
Asexual Reproduction
Sexual Reproduction
Requires more time
- Provides genetic _____________
because DNA comes from both parent
cells
- Advantageous in varying
environments.
Fast!
- All organisms _________________.
- This is an advantage if conditions are
favorable and a disadvantage of they
are not.
The Label the following in this diagram; sister chromatids, homologous pairs, centromere.
Then, fill in the blanks in the box.




Homologous chromosomes are corresponding
chromosomes one which comes from ______ and the
other that comes from________.
Though these chromosomes have the _________
genes, they DO NOT have the same _____________
sequence.
Sister chromatids are genetically _____________ to
each other.
Each chromosome in each pair is _________
armed.
What types of cells have all of the DNA? ____________________ AKA
_______________________.
Cells with both sets of chromosomes (all of the DNA) are called ________ (2n).
What types of cells will have only half the amount of the DNA? ___________________ (sperm
and egg) AKA _____________________
Cells with one set of chromosomes (half the DNA) are called ________ (n).
[Type text]
Complete the following table:
Organism
Number of
chromosomes in
each body cell
(2n)
Corn plant
Number of
chromosomes in a
each sex cell (n)
10
Housefly
12
Fruit fly
8
Complete the graphic organizer:
Fertilization
23
(n)
+
=
List the three sources of genetic variation that result from meiosis and sexual reproduction:
1. _____________________________________________________________________
2. _____________________________________________________________________
3. _____________________________________________________________________
[Type text]
Use the graphic organizer of meiosis to review the key points during the production of gametes.
Be sure to label and define in your own words: tetrads, crossing over, independent
assortment, and nondisjunction.
Meiosis I
Stage
Interphase I
Prophase I
Metaphase I
Anaphase I
Telophase I
Cytokinesis I
Description
Picture
[Type text]
Meiosis II
Stage
(Interphase II)
Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokinesis II
Description
Picture
[Type text]
Describe what is happening in this picture:
_________________________________________
_________________________________________
_________________________________________
In which phase of meiosis does this occur?
________________________________________
Define gametogenesis:
______________________________________________________________________________
______________________________________________________________________________
Use the diagrams below to describe how gametogenesis is different in males and females.
Process:_________________
Result:
________________________
________________________
Process:_________________
Result:
________________________
________________________
[Type text]
Most chromosomal disorders (like Down syndrome) result from the improper separation of
chromosomes during meiosis. This is called ______________________________.
What is trisomy? _______________________________________________________________
_____________________________________________________________________________
Analyze the following karyotype:
a. Is this from a human cell?
_________
b. How do you know?
__________________________
c. What chromosomal disorder
does this patient have?
___________________________
d. Is this a male or female?
_________________
Match the phase of meiosis to the statement that describes it:
_____ Nucleus reforms around 23 single armed chromosomes as cleave furrow
forms
_____ Spindle fibers attach to homologous chromosomes line up along
“equator” or middle of cell
_____ Nucleus breaks down, centrioles migrate, and chromatin condenses into
23 double armed chromosomes
WORD BANK
a. Interphase I
b. Prophase I
c. Metaphase I
d. Anaphase I
_____ Nucleus breaks down, centrioles migrate, tetrads form, crossing over
occurs, chromatin condenses into 46 double armed chromosomes
e. Telophase I
_____ Spindle fibers shorten and pull apart homologous chromosomes
ab. Interphase II
_____ 4 gametes are formed from 2 haploid cells
ac. Prophase II
_____ Spindle fibers attach to centromeres of 23 double armed chromosomes
_____ 2 haploid cells with double armed chromosomes are formed in this
process
ad. Metaphase II
_____ Spindle fibers shorten and pull apart sister chromatids
ae. Anaphase II
bc. Telophase II