BIO 1124 Practice Exam 3 Questions
And All Correct Answers 2025 Edition.
two parents heterozygous for cystic fibrosis have a child with the disease. The parents
areexpecting a second child. What is the probability that the second child will also have cystic
fibrosis?
A. 75% probability
B. 0% probability
C. 100% probability
D. 50% probability
E. 25% probability - Answer E. 25% probability
Which of the following is a regulatory protein that influence the ability of RNA polymerase to
transcribe a gene?
A. DNA polymerase
B. intron
C. transcription factor
D. tRNA
E. ribosome - Answer C. transcription factor
Based on the gene and protein sequences that follow, what type of mutation has occurred and
whatis the effect on the polypeptide?Normal gene: ATGGCCGGCCCGAAAGAGACCMutated gene:
ATGGCCGGCACCGAAAGAGACCNormal protein: Met-Ala-Gly-Pro-Lys-Glu-ThrMutated protein:
Met-Ala-Gly-Thr-Glu-Arg-Asp
A. base insertion—silent
B. substitution—missense
C. base insertion—missense
D. substitution—nonsense
E. base insertion—frameshift - Answer E. base insertion—frameshift
When a single-gene mutation can have multiple phenotypic effects, it is ________.
A. recessive.
B. X-linked.
, If a DNA template strand has a sequence of 3' TACAATGTAGCC 5', the RNA produced from itwill
be which sequence?
A. 3'AUGUUACAUCGG5'
B. 3'TACAATGTAGCC5'
C. 5'AUGUUACAUCGG3'
D. 5'ATGTTACATCGG5'
E. 5'ATGTTACATCGG3' - Answer C. 5'AUGUUACAUCGG3'
height (tallness) in humans is determined by more than one gene. Assume the following:There
are 4 genes that determine height (Aa, Bb, Cc, Dd).Each dominant allele adds 2 inches of height
to an individual.The height of the recessive individual (aa, bb, cc, dd) is 5 feet.What is the height
of a person with the genotype (AA, Bb, cc, DD)?
A. 6 feet, 6 inches
B. 5 feet, 10 inches
C. 5 feet, 8 inches
D. 5 feet, 6 inches
E. 5 feet, 4 inches - Answer B. 5 feet, 10 inches
In Japanese four o'clock flowers, R = red, r = white, and Rr = pink. If two hybrids are crossed,
what are the chances that an offspring will have pink flowers?
A. 75%
B. 0%
C. 50%
D. 100% E. 25% - Answer C. 50%
A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. If
hemarries a woman who is also heterozygous for freckles, ________ percent of their children
arepredicted to be freckled. Also, of all their children, ________ percent are predicted to be
heterozygous.
A. 100%, 100%
B. 75%, 25%
C. 100%, 75%
D. 50%, 50%
And All Correct Answers 2025 Edition.
two parents heterozygous for cystic fibrosis have a child with the disease. The parents
areexpecting a second child. What is the probability that the second child will also have cystic
fibrosis?
A. 75% probability
B. 0% probability
C. 100% probability
D. 50% probability
E. 25% probability - Answer E. 25% probability
Which of the following is a regulatory protein that influence the ability of RNA polymerase to
transcribe a gene?
A. DNA polymerase
B. intron
C. transcription factor
D. tRNA
E. ribosome - Answer C. transcription factor
Based on the gene and protein sequences that follow, what type of mutation has occurred and
whatis the effect on the polypeptide?Normal gene: ATGGCCGGCCCGAAAGAGACCMutated gene:
ATGGCCGGCACCGAAAGAGACCNormal protein: Met-Ala-Gly-Pro-Lys-Glu-ThrMutated protein:
Met-Ala-Gly-Thr-Glu-Arg-Asp
A. base insertion—silent
B. substitution—missense
C. base insertion—missense
D. substitution—nonsense
E. base insertion—frameshift - Answer E. base insertion—frameshift
When a single-gene mutation can have multiple phenotypic effects, it is ________.
A. recessive.
B. X-linked.
, If a DNA template strand has a sequence of 3' TACAATGTAGCC 5', the RNA produced from itwill
be which sequence?
A. 3'AUGUUACAUCGG5'
B. 3'TACAATGTAGCC5'
C. 5'AUGUUACAUCGG3'
D. 5'ATGTTACATCGG5'
E. 5'ATGTTACATCGG3' - Answer C. 5'AUGUUACAUCGG3'
height (tallness) in humans is determined by more than one gene. Assume the following:There
are 4 genes that determine height (Aa, Bb, Cc, Dd).Each dominant allele adds 2 inches of height
to an individual.The height of the recessive individual (aa, bb, cc, dd) is 5 feet.What is the height
of a person with the genotype (AA, Bb, cc, DD)?
A. 6 feet, 6 inches
B. 5 feet, 10 inches
C. 5 feet, 8 inches
D. 5 feet, 6 inches
E. 5 feet, 4 inches - Answer B. 5 feet, 10 inches
In Japanese four o'clock flowers, R = red, r = white, and Rr = pink. If two hybrids are crossed,
what are the chances that an offspring will have pink flowers?
A. 75%
B. 0%
C. 50%
D. 100% E. 25% - Answer C. 50%
A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. If
hemarries a woman who is also heterozygous for freckles, ________ percent of their children
arepredicted to be freckled. Also, of all their children, ________ percent are predicted to be
heterozygous.
A. 100%, 100%
B. 75%, 25%
C. 100%, 75%
D. 50%, 50%
