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Semester Review II December 2009

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

 1. 
In mitosis, if a parent cell has 16 chromosomes, each daughter cell will have how many chromosomes?
a.
64
b.
32
c.
16
d.
8
e.
4
 

 2. 
Homologous chromosomes
a.
may exchange parts during meiosis.
b.
have alleles for the same characteristics even though the gene expression may not be
      the same.
c.
are in pairs, one chromosome of each pair from the father and one from the mother.
d.
pair up during meiosis.
e.
all of these
 

 3. 
Meiosis typically results in the production of
a.
2 diploid cells.
b.
4 diploid cells.
c.
4 haploid cells.
d.
2 haploid cells.
e.
1 triploid cell.
 

 4. 
Which is NOT true of human chromosomes?
a.
The haploid number is 23.
b.
The diploid number is 46.
c.
There are 23 pairs of chromosomes.
d.
Human gametes end up with two of each type of 23 chromosomes.
e.
Human gametes end up one of each type of 23 chromosomes.
 

 5. 
Crossing over is one of the most important events in meiosis because
a.
it produces new arrays of alleles on chromosomes.
b.
homologous chromosomes must be separated into different daughter cells.
c.
the number of chromosomes allotted to each daughter cell must be halved.
d.
homologous chromatids must be separated into different daughter cells.
e.
all of these
 

 6. 
For monohybrid experiments, a testcross could result in which of the following ratios?
a.
1:1
b.
2:1
c.
9:3:3:1
d.
1:2:1
e.
3:1
 

 7. 
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) were crossed, what fraction of the black solid offspring would be homozygous?
a.
4/16
b.
9/16
c.
1/9
d.
3/16
e.
3/4
 

 8. 
Red-green colorblindness is an X-linked recessive trait in humans. A colorblind woman and a man with normal vision have a son. What is the probability that the son is colorblind?
a.
100 percent
b.
75 percent
c.
50 percent
d.
25 percent
e.
0 percent
 

 9. 
When a gene transcription occurs, which of the following is produced?
a.
more DNA
b.
protein or polypeptide sequences
c.
messenger RNA
d.
enzymes
e.
genetic defects
 

 10. 
Artificial selection occurs when
a.
the environment controls which organisms will survive.
b.
humans determine which organisms will survive.
c.
the extremes of the population have a lesser chance to survive.
d.
the extremes of the population have a better chance to survive.
e.
the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
 



 
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