BIO 203 PURDUE EXAM 3
BIO 203 PURDUE EXAM 3 NEWEST 2025 COMPLETE ALL 100
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW VERSION!!
Which of the following is the meaning of the chromosome theory of inheritance as expressed in
the early 20th century? - ANSWER-Mendelian genes are at specific loci on the chromosome and
in turn segregate during meiosis
Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal
color vision have a color-blind son.
What are the genotypes of the parents? - ANSWER-XNXn
and XNY
Cohesins hold together sister chromatids during replication. At what stage of the mitotic cycle
would you expect cohesins to be
cleaved to allow mitosis to continue? - ANSWER-anaphase
For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is
most desirable? - ANSWER-It interferes with rapidly dividing cells
What is the reason that closely linked genes are typically inherited together? - ANSWER-they
are located close together on the same chromosome
How do we describe transformation in bacteria? - ANSWER-assimilation of external DNA into a
cell
Which of the following is an example of alternation of generations? - ANSWER-a diploid plant
(sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain
(gametophyte)
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, BIO 203 PURDUE EXAM 3
Which of the following occurs in meiosis but not in mitosis? - ANSWER-crossing over of
chromosomes
two centrosomes form; chromosomes duplicated during S phase but cannot be seen
individually - ANSWER-interphase
chromosomes become less condense; cell pinches into two daughter cells; mitosis is complete -
ANSWER-telophase
mitotic spindle forms and chromatin fibers become more tightly coiled - ANSWER-prophase
each chromatid becomes a chromosome as kinetochore microtubules are shortened - ANSWER-
anaphase
microtubules from opposite poles attach to kinetochores of sister chromatids - ANSWER-
metaphase
which of the following are among the most common second messengers - ANSWER-calcium ion
and cAMP
Cancer cells have the following qualities: - ANSWER-do not respond normally to the body's
control mechanisms, exhibit neither density dependent inhibitiion nore anchorage dependence,
may not need growth factors to grow and divide, may make their own growth factor, may have
an abnormal cell cycle control system
For many cells, what is the most importantly checkpoint? - ANSWER-G1 checkpoint
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, BIO 203 PURDUE EXAM 3
Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal
pigmentation and have one child out of three who is albino (without melanin pigmentation).
What are the genotypes of the albino's parents? - ANSWER-both parents must be heterozygous
What was the most significant conclusion that Gregor Mendel drew from his experiments with
pea plants - ANSWER-traits are inherited in discrete units and are not the results of "blending"
Mendel accounted for the observation that traits that had disappeared in the F1 generation
reappeared in the F2 generation by
proposing that - ANSWER-traits can be dominant or recessive, and the recessive traits were
obscured by the dominant ones in the F1
Mendel's observation of the segregation of alleles in gamete formation has its basis in which of
the following phases of cell division - ANSWER-anaphase I of meiosis
A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their
daughter have a normal number of digits. Having extra digits is a dominant trait. The couple's
second child has extra digits. What is the probability that their next (third)
child will have extra digits? - ANSWER-1/2
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one.
All of the F1 are pink. What does this say about the parental traits? - ANSWER-red shows
incomplete dominance over white
In his transformation experiments, what did Griffith observe? - ANSWER-Mixing a heat-killed
pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living
cells into the pathogenic form
In trying to determine whether DNA or protein is the genetic material of phage using
radioisotopes, Hershey and Chase made use
3|Page
BIO 203 PURDUE EXAM 3 NEWEST 2025 COMPLETE ALL 100
QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||BRAND NEW VERSION!!
Which of the following is the meaning of the chromosome theory of inheritance as expressed in
the early 20th century? - ANSWER-Mendelian genes are at specific loci on the chromosome and
in turn segregate during meiosis
Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal
color vision have a color-blind son.
What are the genotypes of the parents? - ANSWER-XNXn
and XNY
Cohesins hold together sister chromatids during replication. At what stage of the mitotic cycle
would you expect cohesins to be
cleaved to allow mitosis to continue? - ANSWER-anaphase
For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is
most desirable? - ANSWER-It interferes with rapidly dividing cells
What is the reason that closely linked genes are typically inherited together? - ANSWER-they
are located close together on the same chromosome
How do we describe transformation in bacteria? - ANSWER-assimilation of external DNA into a
cell
Which of the following is an example of alternation of generations? - ANSWER-a diploid plant
(sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain
(gametophyte)
1|Page
, BIO 203 PURDUE EXAM 3
Which of the following occurs in meiosis but not in mitosis? - ANSWER-crossing over of
chromosomes
two centrosomes form; chromosomes duplicated during S phase but cannot be seen
individually - ANSWER-interphase
chromosomes become less condense; cell pinches into two daughter cells; mitosis is complete -
ANSWER-telophase
mitotic spindle forms and chromatin fibers become more tightly coiled - ANSWER-prophase
each chromatid becomes a chromosome as kinetochore microtubules are shortened - ANSWER-
anaphase
microtubules from opposite poles attach to kinetochores of sister chromatids - ANSWER-
metaphase
which of the following are among the most common second messengers - ANSWER-calcium ion
and cAMP
Cancer cells have the following qualities: - ANSWER-do not respond normally to the body's
control mechanisms, exhibit neither density dependent inhibitiion nore anchorage dependence,
may not need growth factors to grow and divide, may make their own growth factor, may have
an abnormal cell cycle control system
For many cells, what is the most importantly checkpoint? - ANSWER-G1 checkpoint
2|Page
, BIO 203 PURDUE EXAM 3
Albinism is an autosomal (not sex-linked) recessive trait. A man and woman are both of normal
pigmentation and have one child out of three who is albino (without melanin pigmentation).
What are the genotypes of the albino's parents? - ANSWER-both parents must be heterozygous
What was the most significant conclusion that Gregor Mendel drew from his experiments with
pea plants - ANSWER-traits are inherited in discrete units and are not the results of "blending"
Mendel accounted for the observation that traits that had disappeared in the F1 generation
reappeared in the F2 generation by
proposing that - ANSWER-traits can be dominant or recessive, and the recessive traits were
obscured by the dominant ones in the F1
Mendel's observation of the segregation of alleles in gamete formation has its basis in which of
the following phases of cell division - ANSWER-anaphase I of meiosis
A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their
daughter have a normal number of digits. Having extra digits is a dominant trait. The couple's
second child has extra digits. What is the probability that their next (third)
child will have extra digits? - ANSWER-1/2
You cross a true-breeding red-flowered snapdragon with a true-breeding white-flowered one.
All of the F1 are pink. What does this say about the parental traits? - ANSWER-red shows
incomplete dominance over white
In his transformation experiments, what did Griffith observe? - ANSWER-Mixing a heat-killed
pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living
cells into the pathogenic form
In trying to determine whether DNA or protein is the genetic material of phage using
radioisotopes, Hershey and Chase made use
3|Page
