BIO 340 FINAL EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
How many chromatids (total) are in a cell with diploid number of 4 (2n = 4) if it is in
G2?
A. 4
B. 2
C. 6
D. 8
E. 16 - ANS ... D. 8
At which points in the cell cycle do you not see chromosomes, but only uncondensed
DNA?
A. During Gap 1 when proteins for cell growth are being manufactured
B. During Synthesis when DNA is replicated
C. During Gap 2 when protein microtubules for the spindle fibers are being made
D. During G0 when the cell is quiescent
E. During all of the above - ANS ... E. During all of the above
In a 2n = 6 organism, how many chromatids are present in each individual cell
immediately at the end of meiosis?
,A. 1
B. 2
C. 3
D. 4
E. 6 - ANS ... C. 3
In a 2n = 6 organism, how many chromatids are present in each individual cell at
prophase II?
A. 1
B. 2
C. 3
D. 4
E. 6 - ANS ... E. 6
In a 2n = 6 organism, are the cells haploid or diploid at prophase II?
A. Haploid
B. Diploid - ANS ... A. Haploid
What strategies were helpful when Gregor Mendel studied patterns of inheritance?
I. Study an organism with a long generation time
II. Study an organism with few offspring per generation
III. Focus on many traits at a time
IV. Look at discontinuous traits
A. Only I
,B. Only III
C. Only IV
D. All of these
E. None of these - ANS ... C. Only IV
In guinea pigs coat color is determined by a single gene with two alleles. A guinea
pig from a true-breeding black strain is mated with a guinea pig from a true-
breeding white strain. The F1 progeny are all black. Two of the F1 progeny are
mated with each other. What proportion of the F2 progeny is expected to be
white?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
E. 7/8 - ANS ... A. 1/4
In guinea pigs coat color is determined by a single gene with two alleles. A guinea
pig from a true-breeding black strain is mated with a guinea pig from a true-
breeding white strain. The F1 progeny are all black. Two of the F1 progeny are
mated with each other. What proportion of the black F2 progeny is expected to be
homozygous?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
E. 7/8 - ANS ... B. 1/3
, In guinea pigs coat color is determined by a single gene with two alleles. Allele B is
dominant and encodes a black coat. Allele b is recessive and encodes a white coat.
If you cross a black guinea pig with a white one, what is the phenotype ratio in the
F1 generation?
A. All black
B. All white
C. 1/2 black, 1/2 white
D. 3/4 black, 1/4 white
E. Need more information - ANS ... E. Need more information
You cross two pea plants, both of which have purple flowers. You are surprised to
see that in the first generation, there are plants with both purple flowers and white
flowers. What is the most likely reason for this?
A. One parent was homozygous recessive and one was heterozygous
B. A new mutation occurred
C. One parent was homozygous recessive and one was homozygous dominant
D. Both parental plants were heterozygous
E. One parent was homozygous dominant and one was heterozygous - ANS ... D.
Both parental plants were heterozygous
Monohybrid crosses illustrate what important law suggested by Mendel?
A. Law of Independent Assortment
B. Law of Segregation
C. Law and Order
D. Law of Heterozygosity
QUESTIONS AND CORRECT ANSWERS
How many chromatids (total) are in a cell with diploid number of 4 (2n = 4) if it is in
G2?
A. 4
B. 2
C. 6
D. 8
E. 16 - ANS ... D. 8
At which points in the cell cycle do you not see chromosomes, but only uncondensed
DNA?
A. During Gap 1 when proteins for cell growth are being manufactured
B. During Synthesis when DNA is replicated
C. During Gap 2 when protein microtubules for the spindle fibers are being made
D. During G0 when the cell is quiescent
E. During all of the above - ANS ... E. During all of the above
In a 2n = 6 organism, how many chromatids are present in each individual cell
immediately at the end of meiosis?
,A. 1
B. 2
C. 3
D. 4
E. 6 - ANS ... C. 3
In a 2n = 6 organism, how many chromatids are present in each individual cell at
prophase II?
A. 1
B. 2
C. 3
D. 4
E. 6 - ANS ... E. 6
In a 2n = 6 organism, are the cells haploid or diploid at prophase II?
A. Haploid
B. Diploid - ANS ... A. Haploid
What strategies were helpful when Gregor Mendel studied patterns of inheritance?
I. Study an organism with a long generation time
II. Study an organism with few offspring per generation
III. Focus on many traits at a time
IV. Look at discontinuous traits
A. Only I
,B. Only III
C. Only IV
D. All of these
E. None of these - ANS ... C. Only IV
In guinea pigs coat color is determined by a single gene with two alleles. A guinea
pig from a true-breeding black strain is mated with a guinea pig from a true-
breeding white strain. The F1 progeny are all black. Two of the F1 progeny are
mated with each other. What proportion of the F2 progeny is expected to be
white?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
E. 7/8 - ANS ... A. 1/4
In guinea pigs coat color is determined by a single gene with two alleles. A guinea
pig from a true-breeding black strain is mated with a guinea pig from a true-
breeding white strain. The F1 progeny are all black. Two of the F1 progeny are
mated with each other. What proportion of the black F2 progeny is expected to be
homozygous?
A. 1/4
B. 1/3
C. 1/2
D. 3/4
E. 7/8 - ANS ... B. 1/3
, In guinea pigs coat color is determined by a single gene with two alleles. Allele B is
dominant and encodes a black coat. Allele b is recessive and encodes a white coat.
If you cross a black guinea pig with a white one, what is the phenotype ratio in the
F1 generation?
A. All black
B. All white
C. 1/2 black, 1/2 white
D. 3/4 black, 1/4 white
E. Need more information - ANS ... E. Need more information
You cross two pea plants, both of which have purple flowers. You are surprised to
see that in the first generation, there are plants with both purple flowers and white
flowers. What is the most likely reason for this?
A. One parent was homozygous recessive and one was heterozygous
B. A new mutation occurred
C. One parent was homozygous recessive and one was homozygous dominant
D. Both parental plants were heterozygous
E. One parent was homozygous dominant and one was heterozygous - ANS ... D.
Both parental plants were heterozygous
Monohybrid crosses illustrate what important law suggested by Mendel?
A. Law of Independent Assortment
B. Law of Segregation
C. Law and Order
D. Law of Heterozygosity
