Name: 
 

Chapter 13 Review Test



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

What is a karyotype?
a.
the set of unique physical characteristics that define an individual
b.
the collection of all the mutations present within a genome
c.
a unique combination of chromosomes found in a gamete
d.
a system of classifying cell nuclei
e.
a display of every pair of homologous chromosomes within a cell, organized according to size and shape
 

 2. 

Which of the following is true of a species that has a chromosome number of 2n = 16?
a.
The species is diploid with 32 chromosomes.
b.
The species has 16 sets of chromosomes.
c.
There are 8 homologous pairs.
d.
During the S phase of the cell cycle there will be 32 separate chromosomes.
e.
A gamete from this species has 4 chromosomes.
 

 3. 

Which of these statements is false?
a.
In humans, each of the 22 maternal autosomes has a homologous paternal chromosome.
b.
In humans, the 23rd pair, the sex chromosomes, determines whether the person is female (XX) or male (XY).
c.
Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2n), single-celled zygote.
d.
At sexual maturity, ovaries and testes produce diploid gametes by meiosis.
e.
Sexual life cycles differ with respect to the relative timing of meiosis and fertilization.
 

 4. 

In animals, meiosis results in gametes, and fertilization results in
a.
spores.
b.
gametophytes.
c.
zygotes.
d.
sporophytes.
e.
clones.
 

 5. 

How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?
a.
They have twice the amount of cytoplasm and half the amount of DNA.
b.
They have half the number of chromosomes and half the amount of DNA.
c.
They have the same number of chromosomes and half the amount of DNA.
d.
They have half the number of chromosomes and one-fourth the amount of DNA.
e.
They have half the amount of cytoplasm and twice the amount of DNA.
 

 6. 

Which of the following happens at the conclusion of meiosis I?
a.
Homologous chromosomes are separated.
b.
The chromosome number is conserved.
c.
Sister chromatids are separated.
d.
Four daughter cells are formed.
e.
The sperm cells elongate to form a head and a tail end.
 

 7. 

Which of the following is true of the process of meiosis?
a.
Two diploid cells result.
b.
Four diploid cells result.
c.
Four haploid cells result.
d.
Four autosomes result.
e.
Four chiasmata result.
 

 8. 

Crossing over occurs during which phase of meiosis?
a.
prophase I
b.
anaphase I
c.
telophase I
d.
prophase II
e.
metaphase II
 
 
Use the following key to answer the following questions. Each answer may be used once, more than once, or not at all.

A. The statement is true for mitosis only.
B. The statement is true for meiosis I only.
C. The statement is true for meiosis II only.
D. The statement is true for mitosis and meiosis I.
E. The statement is true for mitosis and meiosis II.
 

 9. 

A cell divides to produce two daughter cells that are genetically identical.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 10. 

Homologous chromosomes synapse and crossing over occurs.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 11. 

Centromeres uncouple and chromatids are separated from each other.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 12. 

Independent assortment of chromosomes occurs.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 13. 

The process is preceded by replication of the DNA.
a.
A
b.
B
c.
C
d.
D
e.
E
 
 
You isolate DNA from three different cell types of an organism, determine the relative DNA content for each type, and plot the results on the graph shown in the figure below. Refer to the graph to answer the following questions.

chpt13_files/i0160000.jpg
 

 14. 

If the cells were from a plant, which sample might represent a gametophyte cell?
a.
I
b.
II
c.
III
d.
either I or II
e.
either II or III
 

 15. 

Which sample of DNA might be from a nerve cell arrested in G0 of the cell cycle?
a.
I
b.
II
c.
III
d.
either I or II
e.
either II or III
 

 16. 

Which sample might represent an animal cell in G2 phase of the cell cycle?
a.
I
b.
II
c.
III
d.
both I and II
e.
both II and III
 

 17. 

During meiosis, cells go from what number to what number?
a.
I to II to I to III
b.
I to II to III
c.
II to I
d.
III to I
e.
always remain at I
 

 18. 

During mitosis, diploid cells go from what number to what number?
a.
I to III
b.
I to II
c.
II to III
d.
II to I
e.
always remain at II
 

 19. 

Independent assortment of chromosomes is a result of
a.
the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I.
b.
the random nature of the fertilization of ova by sperm.
c.
the random distribution of the sister chromatids to the two daughter cells during anaphase II.
d.
the relatively small degree of homology shared by the X and Y chromosomes.
e.
all of the above
 

 20. 

Which of the following statements about crossing over is incorrect?
a.
Crossing over combines sections of the maternal and paternal chromosomes.
b.
Crossing over plays a role in both sexual and asexual reproduction.
c.
There are on average one to three crossover events per chromosome.
d.
Crossing over increases the extent of genetic variation beyond what is possible through independent assortment alone.
e.
Crossing over results in recombinant chromosomes.
 



 
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