BIO 201 Exam 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
Which of the following is TRUE about mutations?
a) most healthy individuals have no mutations.
b) most somatic mutations are harmful
c) mutations occur in germ-line cells, but not in somatic cells
d) mutations that occur in breast tissue can be passed on to offspring
e) none of the above - CORRECT ANSWER - e) none of the above
Which of the following in NOT a general pattern of variation in natural populations?
a) all individuals are likely to carry new mutations
b) some variant types will likely occur more than once in the population
c) some variant types will be similar across different species
d) most variant phenotypes are harmful - CORRECT ANSWER - d) most variant
phenotypes are harmful
Which of the following is TRUE about mutations?
a) environmental conditions determine which mutations are most likely to occur
b) mutations are rare in nature because the cell's DNA machinery repairs them
c) most new mutations in an individual will not be inherited by its offspring
d) toxic chemicals are a common cause of mutations in living organisms
e) radiation is the most common cause of mutations in living organisms - CORRECT
ANSWER - c) most new mutations in an individual will not be inherited by its offspring
Which of the following is FALSE about mutations?
a) environmental conditions determine which mutations are most likely to occur
b) mutations are the origin of all genetic variation in natural populations
c) most new mutations in an individual will not be inherited by its offspring
,d) toxic chemicals are nota common cause of mutations in living organisms
e) most mutations are due to errors in DNA replication that are not repaired - CORRECT
ANSWER - a) environmental conditions determine which mutations are most likely to
occur
When a new mutation occurs in a gamete cell and that gamete is involved in a fertilization event,
resulting in a new individual in the population, which of the following is TRUE?
a) The individual will have the same alleles as both of its parents
b) there is a chance that the individual will pass on the mutation to offspring
c) some but not all of the individual's body cells will have the mutation
d) all of the individual's gametes will carry the mutation - CORRECT ANSWER - b) there
is a chance that the individual will pass on the mutation to offspring
Which of the following is true about mutation as the "factory of variation production"?
a) it is constantly occurring in all organisms undergoing cell division
b) it is an unpreventable process
c) it is originally responsible for the production of all new alleles
d) all of the above - CORRECT ANSWER - d) all of the above
Where in the human body do the mutations that can be inherited by offspring occur? -
CORRECT ANSWER - in the ovaries and testes
What is the DIRECT cause of MOST new mutations? - CORRECT ANSWER - errors in
DNA replication
(T/F) Genetic variants that are now common first originated as common variants in a large
number of individuals. - CORRECT ANSWER - False
(T/F) There is selective pressure for organisms to have few or no new mutations in their
genomes. - CORRECT ANSWER - False
, Which of the following is different in mouse populations in locations with dark backgrounds
compared to mouse populations in locations with light backgrounds?
a) the frequency of mutations
b) the impact of transcription on phenotypes
c) the impact of translation on phenotypes
d) the role of fur color in mouse survival
e) none of the above - CORRECT ANSWER - e) none of the above
A population of oak trees produces acorns with many different sizes. What kind of selection is
likely occurring if the smallest and the largest acorns have the highest probability of survival and
intermediate size acorns have the lowest probability of survival?
a) directional selection
b) stabilizing selection
c) disruptive selection
d) no selection is likely occurring - CORRECT ANSWER - c) disruptive selection
Stable and consistent patterns in which a different frequency of phenotypic variants of a species
are found in different geographic areas are most likely explained by:
a) different mutations occurring in different geographic areas
b) different impacts of transcription and translation on phenotypes in different geographic areas
c) different environmental conditions affecting survival and reproduction in different
geographical areas
d) different levels of genetic recombination and independent assortment in different geographic
areas
e) different wats in which proteins influence cell structure and function in different geographic
areas
e) different ways in which proteins influence cell structure and function in different geographic
areas - CORRECT ANSWER - c) different environmental conditions affecting survival
and reproduction in different geographical areas
Exam Questions and CORRECT Answers
Which of the following is TRUE about mutations?
a) most healthy individuals have no mutations.
b) most somatic mutations are harmful
c) mutations occur in germ-line cells, but not in somatic cells
d) mutations that occur in breast tissue can be passed on to offspring
e) none of the above - CORRECT ANSWER - e) none of the above
Which of the following in NOT a general pattern of variation in natural populations?
a) all individuals are likely to carry new mutations
b) some variant types will likely occur more than once in the population
c) some variant types will be similar across different species
d) most variant phenotypes are harmful - CORRECT ANSWER - d) most variant
phenotypes are harmful
Which of the following is TRUE about mutations?
a) environmental conditions determine which mutations are most likely to occur
b) mutations are rare in nature because the cell's DNA machinery repairs them
c) most new mutations in an individual will not be inherited by its offspring
d) toxic chemicals are a common cause of mutations in living organisms
e) radiation is the most common cause of mutations in living organisms - CORRECT
ANSWER - c) most new mutations in an individual will not be inherited by its offspring
Which of the following is FALSE about mutations?
a) environmental conditions determine which mutations are most likely to occur
b) mutations are the origin of all genetic variation in natural populations
c) most new mutations in an individual will not be inherited by its offspring
,d) toxic chemicals are nota common cause of mutations in living organisms
e) most mutations are due to errors in DNA replication that are not repaired - CORRECT
ANSWER - a) environmental conditions determine which mutations are most likely to
occur
When a new mutation occurs in a gamete cell and that gamete is involved in a fertilization event,
resulting in a new individual in the population, which of the following is TRUE?
a) The individual will have the same alleles as both of its parents
b) there is a chance that the individual will pass on the mutation to offspring
c) some but not all of the individual's body cells will have the mutation
d) all of the individual's gametes will carry the mutation - CORRECT ANSWER - b) there
is a chance that the individual will pass on the mutation to offspring
Which of the following is true about mutation as the "factory of variation production"?
a) it is constantly occurring in all organisms undergoing cell division
b) it is an unpreventable process
c) it is originally responsible for the production of all new alleles
d) all of the above - CORRECT ANSWER - d) all of the above
Where in the human body do the mutations that can be inherited by offspring occur? -
CORRECT ANSWER - in the ovaries and testes
What is the DIRECT cause of MOST new mutations? - CORRECT ANSWER - errors in
DNA replication
(T/F) Genetic variants that are now common first originated as common variants in a large
number of individuals. - CORRECT ANSWER - False
(T/F) There is selective pressure for organisms to have few or no new mutations in their
genomes. - CORRECT ANSWER - False
, Which of the following is different in mouse populations in locations with dark backgrounds
compared to mouse populations in locations with light backgrounds?
a) the frequency of mutations
b) the impact of transcription on phenotypes
c) the impact of translation on phenotypes
d) the role of fur color in mouse survival
e) none of the above - CORRECT ANSWER - e) none of the above
A population of oak trees produces acorns with many different sizes. What kind of selection is
likely occurring if the smallest and the largest acorns have the highest probability of survival and
intermediate size acorns have the lowest probability of survival?
a) directional selection
b) stabilizing selection
c) disruptive selection
d) no selection is likely occurring - CORRECT ANSWER - c) disruptive selection
Stable and consistent patterns in which a different frequency of phenotypic variants of a species
are found in different geographic areas are most likely explained by:
a) different mutations occurring in different geographic areas
b) different impacts of transcription and translation on phenotypes in different geographic areas
c) different environmental conditions affecting survival and reproduction in different
geographical areas
d) different levels of genetic recombination and independent assortment in different geographic
areas
e) different wats in which proteins influence cell structure and function in different geographic
areas
e) different ways in which proteins influence cell structure and function in different geographic
areas - CORRECT ANSWER - c) different environmental conditions affecting survival
and reproduction in different geographical areas
