CMB 352 Exam 2 With
Correct Answers
If bacteriophage are labeled with radioactive sulfur and allowed to infect
bacterial cells, the infected bacterial cells prior to lysis are expected...
a) to be non-radioactive
b) to have radioactive DNA
c) to have radioactive proteins
d) to have radioactive DNA and proteins
e) to have radioactive carbohydrates - ANSWER a) to be non-radioactive
Out of 800 progeny of a three point test cross there were 16 double
crossover recombinant progeny whereas 80 had been expected on the basis
of no interference. The interference is...
a) 0.10
b) 0.20
c) 0.05
d) 0.50
e) 0.80 - ANSWER e) 0.80
A plant of genotype CCdd is crossed to ccDD and the F1 testcrossed to ccdd.
If the genes are linked and 40 map units apart the percentage of ccdd test
,cross progeny will be...
a) 10
b) 20
c) 25
d) 50
e) 75 - ANSWER b) 20
In maize the genes W and D are so tightly linked that virtually no crossovers
occur between them. A dihybrid Wd/wD is test crossed to wd/wd. What
phenotypic types and in what proportion would you expect among the test
cross progeny?
a) 1/4 WD, 1/4 wd, 1/4 Wd, 1/4 wD
b) 1/2 WD, 1/2 wd
c) 1/8 Wd, 1/8 wd, 3/8 Wd, 3/8 wD
d) 1/2 Wd, 1/2 wD
e) non of the above - ANSWER d) 1/2 Wd, 1/2 wD
In 1982, Frederick Griffith's experiments with Streptococcus pneumoniae
suggested that...
a) bacteria do not incorporate the DNA of the other bacteria
b) attenuated R (rough) bacteria easily revert to the wild type (virulent)
c) DNA was conclusively the molecule of heredity
d) heat killed bacteria could somehow "transform" live bacteria
, e) all of the above - ANSWER d) heat killed bacteria could somehow
"transform" live bacteria
Which term best describes an individual with Klinefelter syndrome?
a) euploid
b) aneuploid
c) polyploid
d) triploid
e) monosomic - ANSWER b) aneuploid
How can a deletion of a portion of a chromosome occur?
a) unequal crossing over during meiotic prophase
b) spindle failure during chromosome separation
c) recombination within an inversion loop
d) exposure to radiation
e) A and D
f) A, C, and D - ANSWER f) A, C, and D
unequal crossing over during meiotic prophase
recombination within an inversion loop
exposure to radiation
How many chromosomes would be found in an allopolyploid plant if its
parent had diploid numbers of 4 and 6 respectively?
Correct Answers
If bacteriophage are labeled with radioactive sulfur and allowed to infect
bacterial cells, the infected bacterial cells prior to lysis are expected...
a) to be non-radioactive
b) to have radioactive DNA
c) to have radioactive proteins
d) to have radioactive DNA and proteins
e) to have radioactive carbohydrates - ANSWER a) to be non-radioactive
Out of 800 progeny of a three point test cross there were 16 double
crossover recombinant progeny whereas 80 had been expected on the basis
of no interference. The interference is...
a) 0.10
b) 0.20
c) 0.05
d) 0.50
e) 0.80 - ANSWER e) 0.80
A plant of genotype CCdd is crossed to ccDD and the F1 testcrossed to ccdd.
If the genes are linked and 40 map units apart the percentage of ccdd test
,cross progeny will be...
a) 10
b) 20
c) 25
d) 50
e) 75 - ANSWER b) 20
In maize the genes W and D are so tightly linked that virtually no crossovers
occur between them. A dihybrid Wd/wD is test crossed to wd/wd. What
phenotypic types and in what proportion would you expect among the test
cross progeny?
a) 1/4 WD, 1/4 wd, 1/4 Wd, 1/4 wD
b) 1/2 WD, 1/2 wd
c) 1/8 Wd, 1/8 wd, 3/8 Wd, 3/8 wD
d) 1/2 Wd, 1/2 wD
e) non of the above - ANSWER d) 1/2 Wd, 1/2 wD
In 1982, Frederick Griffith's experiments with Streptococcus pneumoniae
suggested that...
a) bacteria do not incorporate the DNA of the other bacteria
b) attenuated R (rough) bacteria easily revert to the wild type (virulent)
c) DNA was conclusively the molecule of heredity
d) heat killed bacteria could somehow "transform" live bacteria
, e) all of the above - ANSWER d) heat killed bacteria could somehow
"transform" live bacteria
Which term best describes an individual with Klinefelter syndrome?
a) euploid
b) aneuploid
c) polyploid
d) triploid
e) monosomic - ANSWER b) aneuploid
How can a deletion of a portion of a chromosome occur?
a) unequal crossing over during meiotic prophase
b) spindle failure during chromosome separation
c) recombination within an inversion loop
d) exposure to radiation
e) A and D
f) A, C, and D - ANSWER f) A, C, and D
unequal crossing over during meiotic prophase
recombination within an inversion loop
exposure to radiation
How many chromosomes would be found in an allopolyploid plant if its
parent had diploid numbers of 4 and 6 respectively?
